61616631 has 8 divisors (see below), whose sum is σ = 83002864. Its totient is φ = 40654080.

The previous prime is 61616629. The next prime is 61616641. The reversal of 61616631 is 13661616.

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

It is not a de Polignac number, because 61616631 - 2¹ = 61616629 is a prime.

It is a super-2 number, since 2×61616631² = 7593218431580322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61616641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105580 + ... + 106161.

It is an arithmetic number, because the mean of its divisors is an integer number (10375358).

Almost surely, 2^61616631 is an apocalyptic number.

61616631 is a deficient number, since it is larger than the sum of its proper divisors (21386233).

61616631 is a wasteful number, since it uses less digits than its factorization.

61616631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211841.

The product of its digits is 3888, while the sum is 30.

The square root of 61616631 is about 7849.6261694427. The cubic root of 61616631 is about 394.9717033621.

The spelling of 61616631 in words is "sixty-one million, six hundred sixteen thousand, six hundred thirty-one".