1213762532981 has 4 divisors (see below), whose sum is σ = 1213772347500. Its totient is φ = 1213752718464.

The previous prime is 1213762532977. The next prime is 1213762532987. The reversal of 1213762532981 is 1892352673121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1022626562500 + 191135970481 = 1011250^2 + 437191^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213762532981 - 2² = 1213762532977 is a prime.

It is a super-2 number, since 2×1213762532981² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213762532987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4719356 + ... + 4969893.

It is an arithmetic number, because the mean of its divisors is an integer number (303443086875).

Almost surely, 2^{1213762532981} is an apocalyptic number.

It is an amenable number.

1213762532981 is a deficient number, since it is larger than the sum of its proper divisors (9814519).

1213762532981 is an equidigital number, since it uses as much as digits as its factorization.

1213762532981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9814518.

The product of its digits is 1088640, while the sum is 50.

The spelling of 1213762532981 in words is "one trillion, two hundred thirteen billion, seven hundred sixty-two million, five hundred thirty-two thousand, nine hundred eighty-one".