1250798428881 has 9 divisors (see below), whose sum is σ = 1806713688091. Its totient is φ = 833863382472.

The previous prime is 1250798428879. The next prime is 1250798428933. The reversal of 1250798428881 is 1888248970521.

The square root of 1250798428881 is 1118391.

It is a perfect power (a square), and thus also a powerful number.

1250798428881 is a `hidden beast` number, since 1 + 2 + 507 + 9 + 8 + 42 + 8 + 8 + 81 = 666.

It can be written as a sum of positive squares in only one way, i.e., 646006025025 + 604792403856 = 803745^2 + 777684^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 1250798428881 - 2¹ = 1250798428879 is a prime.

It is a super-2 number, since 2×1250798428881² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1250798428871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3168775 + ... + 3541571.

Almost surely, 2^{1250798428881} is an apocalyptic number.

1250798428881 is the 1118391-st square number.

1250798428881 is the 559196-th centered octagonal number.

It is an amenable number.

1250798428881 is a deficient number, since it is larger than the sum of its proper divisors (555915259210).

1250798428881 is an frugal number, since it uses more digits than its factorization.

1250798428881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 745600 (or 372800 counting only the distinct ones).

The product of its (nonzero) digits is 20643840, while the sum is 63.

The spelling of 1250798428881 in words is "one trillion, two hundred fifty billion, seven hundred ninety-eight million, four hundred twenty-eight thousand, eight hundred eighty-one".