61139651 has 12 divisors (see below), whose sum is σ = 64426416. Its totient is φ = 57977280.

The previous prime is 61139647. The next prime is 61139653. The reversal of 61139651 is 15693116.

It is a happy number.

It is not a de Polignac number, because 61139651 - 2² = 61139647 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61139653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61706 + ... + 62688.

It is an arithmetic number, because the mean of its divisors is an integer number (5368868).

Almost surely, 2^61139651 is an apocalyptic number.

61139651 is a deficient number, since it is larger than the sum of its proper divisors (3286765).

61139651 is an equidigital number, since it uses as much as digits as its factorization.

61139651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1102 (or 1061 counting only the distinct ones).

The product of its digits is 4860, while the sum is 32.

The square root of 61139651 is about 7819.1848040573. The cubic root of 61139651 is about 393.9498914175.

The spelling of 61139651 in words is "sixty-one million, one hundred thirty-nine thousand, six hundred fifty-one".