61531111910 has 32 divisors (see below), whose sum is σ = 111061020672. Its totient is φ = 24544729440.

The previous prime is 61531111879. The next prime is 61531111919. The reversal of 61531111910 is 1911113516.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61531111919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11326895 + ... + 11332325.

It is an arithmetic number, because the mean of its divisors is an integer number (3470656896).

Almost surely, 2^61531111910 is an apocalyptic number.

61531111910 is a deficient number, since it is larger than the sum of its proper divisors (49529908762).

61531111910 is a wasteful number, since it uses less digits than its factorization.

61531111910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8348.

The product of its (nonzero) digits is 810, while the sum is 29.

The spelling of 61531111910 in words is "sixty-one billion, five hundred thirty-one million, one hundred eleven thousand, nine hundred ten".