61310251 has 4 divisors (see below), whose sum is σ = 61883352. Its totient is φ = 60737152.

The previous prime is 61310243. The next prime is 61310261. The reversal of 61310251 is 15201316.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61310251 - 2³ = 61310243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61310201) 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, 286390 + ... + 286603.

It is an arithmetic number, because the mean of its divisors is an integer number (15470838).

Almost surely, 2^61310251 is an apocalyptic number.

61310251 is a deficient number, since it is larger than the sum of its proper divisors (573101).

61310251 is a wasteful number, since it uses less digits than its factorization.

61310251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573100.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 61310251 is about 7830.0862702783. The cubic root of 61310251 is about 394.3159682942.

Adding to 61310251 its reverse (15201316), we get a palindrome (76511567).

The spelling of 61310251 in words is "sixty-one million, three hundred ten thousand, two hundred fifty-one".