1249608743881 has 9 divisors (see below), whose sum is σ = 1261974934119. Its totient is φ = 1237362598536.

The previous prime is 1249608743869. The next prime is 1249608743899. The reversal of 1249608743881 is 1883478069421.

The square root of 1249608743881 is 1117859.

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

It can be written as a sum of positive squares in only one way, i.e., 673047956025 + 576560787856 = 820395^2 + 759316^2 .

It is not a de Polignac number, because 1249608743881 - 2⁷ = 1249608743753 is a prime.

It is a super-2 number, since 2×1249608743881² (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 (1249608843881) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 115134051 + ... + 115144903.

Almost surely, 2^{1249608743881} is an apocalyptic number.

1249608743881 is the 1117859-th square number.

1249608743881 is the 558930-th centered octagonal number.

It is an amenable number.

1249608743881 is a deficient number, since it is larger than the sum of its proper divisors (12366190238).

1249608743881 is an frugal number, since it uses more digits than its factorization.

1249608743881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21912 (or 10956 counting only the distinct ones).

The product of its (nonzero) digits is 18579456, while the sum is 61.

The spelling of 1249608743881 in words is "one trillion, two hundred forty-nine billion, six hundred eight million, seven hundred forty-three thousand, eight hundred eighty-one".