61612131 has 16 divisors (see below), whose sum is σ = 99408384. Its totient is φ = 33135744.

The previous prime is 61612123. The next prime is 61612139. The reversal of 61612131 is 13121616.

It is an interprime number because it is at equal distance from previous prime (61612123) and next prime (61612139).

It is not a de Polignac number, because 61612131 - 2³ = 61612123 is a prime.

It is a super-2 number, since 2×61612131² = 7592109372722322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 61612098 and 61612107.

It is not an unprimeable number, because it can be changed into a prime (61612139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85935 + ... + 86648.

It is an arithmetic number, because the mean of its divisors is an integer number (6213024).

Almost surely, 2^61612131 is an apocalyptic number.

61612131 is a deficient number, since it is larger than the sum of its proper divisors (37796253).

61612131 is a wasteful number, since it uses less digits than its factorization.

61612131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172610.

The product of its digits is 216, while the sum is 21.

The square root of 61612131 is about 7849.3395263551. The cubic root of 61612131 is about 394.9620879065.

Adding to 61612131 its reverse (13121616), we get a palindrome (74733747).

The spelling of 61612131 in words is "sixty-one million, six hundred twelve thousand, one hundred thirty-one".