61261333631 has 4 divisors (see below), whose sum is σ = 61999422072. Its totient is φ = 60523245192.

The previous prime is 61261333619. The next prime is 61261333633. The reversal of 61261333631 is 13633316216.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61261333631 is a prime.

It is a super-2 number, since 2×61261333631² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61261333591 and 61261333600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61261333633) 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, 369044096 + ... + 369044261.

It is an arithmetic number, because the mean of its divisors is an integer number (15499855518).

Almost surely, 2^61261333631 is an apocalyptic number.

61261333631 is a deficient number, since it is larger than the sum of its proper divisors (738088441).

61261333631 is an equidigital number, since it uses as much as digits as its factorization.

61261333631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 738088440.

The product of its digits is 34992, while the sum is 35.

Adding to 61261333631 its reverse (13633316216), we get a palindrome (74894649847).

The spelling of 61261333631 in words is "sixty-one billion, two hundred sixty-one million, three hundred thirty-three thousand, six hundred thirty-one".