61312857 has 4 divisors (see below), whose sum is σ = 81750480. Its totient is φ = 40875236.

The previous prime is 61312841. The next prime is 61312861. The reversal of 61312857 is 75821316.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61312857 - 2⁴ = 61312841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61312817) 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, 10218807 + ... + 10218812.

It is an arithmetic number, because the mean of its divisors is an integer number (20437620).

Almost surely, 2^61312857 is an apocalyptic number.

It is an amenable number.

61312857 is a deficient number, since it is larger than the sum of its proper divisors (20437623).

61312857 is a wasteful number, since it uses less digits than its factorization.

61312857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20437622.

The product of its digits is 10080, while the sum is 33.

The square root of 61312857 is about 7830.2526779153. The cubic root of 61312857 is about 394.3215550318.

The spelling of 61312857 in words is "sixty-one million, three hundred twelve thousand, eight hundred fifty-seven".