61631651 has 8 divisors (see below), whose sum is σ = 65880864. Its totient is φ = 57513280.

The previous prime is 61631639. The next prime is 61631659. The reversal of 61631651 is 15613616.

61631651 is nontrivially palindromic in base 16.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61631651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61631659) 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, 31736 + ... + 33621.

It is an arithmetic number, because the mean of its divisors is an integer number (8235108).

Almost surely, 2^61631651 is an apocalyptic number.

61631651 is a deficient number, since it is larger than the sum of its proper divisors (4249213).

61631651 is a wasteful number, since it uses less digits than its factorization.

61631651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65421.

The product of its digits is 3240, while the sum is 29.

The square root of 61631651 is about 7850.5828446046. The cubic root of 61631651 is about 395.0037942273.

The spelling of 61631651 in words is "sixty-one million, six hundred thirty-one thousand, six hundred fifty-one".