61639501 has 48 divisors (see below), whose sum is σ = 85795200. Its totient is φ = 43747200.

The previous prime is 61639493. The next prime is 61639541. The reversal of 61639501 is 10593616.

It is not a de Polignac number, because 61639501 - 2³ = 61639493 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61639541) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1988356 + ... + 1988386.

It is an arithmetic number, because the mean of its divisors is an integer number (1787400).

Almost surely, 2^61639501 is an apocalyptic number.

It is an amenable number.

61639501 is a deficient number, since it is larger than the sum of its proper divisors (24155699).

61639501 is a wasteful number, since it uses less digits than its factorization.

61639501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111 (or 66 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 61639501 is about 7851.0827915645. The cubic root of 61639501 is about 395.0205640098.

The spelling of 61639501 in words is "sixty-one million, six hundred thirty-nine thousand, five hundred one".