61634139 has 16 divisors (see below), whose sum is σ = 94851840. Its totient is φ = 34869600.

The previous prime is 61634051. The next prime is 61634143. The reversal of 61634139 is 93143616.

It is not a de Polignac number, because 61634139 - 2⁸ = 61633883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61634239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12409 + ... + 16650.

It is an arithmetic number, because the mean of its divisors is an integer number (5928240).

Almost surely, 2^61634139 is an apocalyptic number.

61634139 is a deficient number, since it is larger than the sum of its proper divisors (33217701).

61634139 is a wasteful number, since it uses less digits than its factorization.

61634139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29170.

The product of its digits is 11664, while the sum is 33.

The square root of 61634139 is about 7850.7413025777. The cubic root of 61634139 is about 395.0091094411.

The spelling of 61634139 in words is "sixty-one million, six hundred thirty-four thousand, one hundred thirty-nine".