961139062129 has 3 divisors (see below), whose sum is σ = 961140042507. Its totient is φ = 961138081752.

The previous prime is 961139062057. The next prime is 961139062139. The reversal of 961139062129 is 921260931169.

The square root of 961139062129 is 980377.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 142562880625 + 818576181504 = 377575^2 + 904752^2 .

It is not a de Polignac number, because 961139062129 - 2²⁵ = 961105507697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (961139062139) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 490189 + ... + 1470565.

It is an arithmetic number, because the mean of its divisors is an integer number (320380014169).

Almost surely, 2^961139062129 is an apocalyptic number.

961139062129 is the 980377-th square number.

961139062129 is the 490189-th centered octagonal number.

It is an amenable number.

961139062129 is a deficient number, since it is larger than the sum of its proper divisors (980378).

961139062129 is an frugal number, since it uses more digits than its factorization.

961139062129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1960754 (or 980377 counting only the distinct ones).

The product of its (nonzero) digits is 314928, while the sum is 49.

Multiplying 961139062129 by its sum of digits (49), we get a square (47095814044321 = 6862639²).

The spelling of 961139062129 in words is "nine hundred sixty-one billion, one hundred thirty-nine million, sixty-two thousand, one hundred twenty-nine".