61131204 has 18 divisors (see below), whose sum is σ = 154526190. Its totient is φ = 20377056.

The previous prime is 61131199. The next prime is 61131223. The reversal of 61131204 is 40213116.

It is a happy number.

61131204 is a `hidden beast` number, since 611 + 31 + 20 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 35426304 + 25704900 = 5952^2 + 5070^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 849009 + ... + 849080.

Almost surely, 2^61131204 is an apocalyptic number.

It is an amenable number.

61131204 is an abundant number, since it is smaller than the sum of its proper divisors (93394986).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61131204 is a wasteful number, since it uses less digits than its factorization.

61131204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1698099 (or 1698094 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 61131204 is about 7818.6446395779. The cubic root of 61131204 is about 393.9317479927.

The spelling of 61131204 in words is "sixty-one million, one hundred thirty-one thousand, two hundred four".