61636631 has 8 divisors (see below), whose sum is σ = 70949760. Its totient is φ = 52450488.

The previous prime is 61636621. The next prime is 61636633. The reversal of 61636631 is 13663616.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61636631 - 2¹⁸ = 61374487 is a prime.

It is a super-2 number, since 2×61636631² = 7598148562060322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61636633) 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 7 ways as a sum of consecutive naturals, for example, 30701 + ... + 32646.

It is an arithmetic number, because the mean of its divisors is an integer number (8868720).

Almost surely, 2^61636631 is an apocalyptic number.

61636631 is a deficient number, since it is larger than the sum of its proper divisors (9313129).

61636631 is a wasteful number, since it uses less digits than its factorization.

61636631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63493.

The product of its digits is 11664, while the sum is 32.

The square root of 61636631 is about 7850.9000121005. The cubic root of 61636631 is about 395.0144330570.

The spelling of 61636631 in words is "sixty-one million, six hundred thirty-six thousand, six hundred thirty-one".