61313257 has 16 divisors (see below), whose sum is σ = 65111040. Its totient is φ = 57657600.

The previous prime is 61313249. The next prime is 61313267. The reversal of 61313257 is 75231316.

It is a cyclic number.

It is not a de Polignac number, because 61313257 - 2³ = 61313249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61313267) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195733 + ... + 196045.

It is an arithmetic number, because the mean of its divisors is an integer number (4069440).

Almost surely, 2^61313257 is an apocalyptic number.

It is an amenable number.

61313257 is a deficient number, since it is larger than the sum of its proper divisors (3797783).

61313257 is a wasteful number, since it uses less digits than its factorization.

61313257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504.

The product of its digits is 3780, while the sum is 28.

The square root of 61313257 is about 7830.2782198336. The cubic root of 61313257 is about 394.3224125370.

The spelling of 61313257 in words is "sixty-one million, three hundred thirteen thousand, two hundred fifty-seven".