61212865 has 32 divisors (see below), whose sum is σ = 87056640. Its totient is φ = 40449024.

The previous prime is 61212841. The next prime is 61212871. The reversal of 61212865 is 56821216.

It is not a de Polignac number, because 61212865 - 2²¹ = 59115713 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 133717 + ... + 134173.

It is an arithmetic number, because the mean of its divisors is an integer number (2720520).

Almost surely, 2^61212865 is an apocalyptic number.

It is an amenable number.

61212865 is a deficient number, since it is larger than the sum of its proper divisors (25843775).

61212865 is a wasteful number, since it uses less digits than its factorization.

61212865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601.

The product of its digits is 5760, while the sum is 31.

The square root of 61212865 is about 7823.8650934177. The cubic root of 61212865 is about 394.1070787835.

The spelling of 61212865 in words is "sixty-one million, two hundred twelve thousand, eight hundred sixty-five".