61536631 has 4 divisors (see below), whose sum is σ = 66270232. Its totient is φ = 56803032.

The previous prime is 61536599. The next prime is 61536659. The reversal of 61536631 is 13663516.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 61536631 - 2⁵ = 61536599 is a prime.

It is a super-2 number, since 2×61536631² = 7573513909660322, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 61536593 and 61536602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61536131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2366781 + ... + 2366806.

It is an arithmetic number, because the mean of its divisors is an integer number (16567558).

Almost surely, 2^61536631 is an apocalyptic number.

61536631 is a deficient number, since it is larger than the sum of its proper divisors (4733601).

61536631 is a wasteful number, since it uses less digits than its factorization.

61536631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4733600.

The product of its digits is 9720, while the sum is 31.

The square root of 61536631 is about 7844.5287302680. The cubic root of 61536631 is about 394.8006920587.

The spelling of 61536631 in words is "sixty-one million, five hundred thirty-six thousand, six hundred thirty-one".