61631811 has 6 divisors (see below), whose sum is σ = 89023740. Its totient is φ = 41087868.

The previous prime is 61631747. The next prime is 61631819. The reversal of 61631811 is 11813616.

61631811 is a `hidden beast` number, since 616 + 31 + 8 + 11 = 666.

It is not a de Polignac number, because 61631811 - 2⁶ = 61631747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61631819) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3423981 + ... + 3423998.

It is an arithmetic number, because the mean of its divisors is an integer number (14837290).

Almost surely, 2^61631811 is an apocalyptic number.

61631811 is a deficient number, since it is larger than the sum of its proper divisors (27391929).

61631811 is a wasteful number, since it uses less digits than its factorization.

61631811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6847985 (or 6847982 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 61631811 is about 7850.5930349242. The cubic root of 61631811 is about 395.0041360460.

The spelling of 61631811 in words is "sixty-one million, six hundred thirty-one thousand, eight hundred eleven".