61133631 has 32 divisors (see below), whose sum is σ = 90256320. Its totient is φ = 36578304.

The previous prime is 61133603. The next prime is 61133669. The reversal of 61133631 is 13633116.

It is not a de Polignac number, because 61133631 - 2¹¹ = 61131583 is a prime.

It is a super-2 number, since 2×61133631² = 7474641678488322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61133531) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 310225 + ... + 310421.

It is an arithmetic number, because the mean of its divisors is an integer number (2820510).

Almost surely, 2^61133631 is an apocalyptic number.

61133631 is a deficient number, since it is larger than the sum of its proper divisors (29122689).

61133631 is a wasteful number, since it uses less digits than its factorization.

61133631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395.

The product of its digits is 972, while the sum is 24.

The square root of 61133631 is about 7818.7998439658. The cubic root of 61133631 is about 393.9369611497.

Adding to 61133631 its reverse (13633116), we get a palindrome (74766747).

The spelling of 61133631 in words is "sixty-one million, one hundred thirty-three thousand, six hundred thirty-one".