61251313 has 4 divisors (see below), whose sum is σ = 61939620. Its totient is φ = 60563008.

The previous prime is 61251301. The next prime is 61251331. The reversal of 61251313 is 31315216.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13198689 + 48052624 = 3633^2 + 6932^2 .

It is a cyclic number.

It is not a de Polignac number, because 61251313 - 2⁹ = 61250801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61251353) 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, 344020 + ... + 344197.

It is an arithmetic number, because the mean of its divisors is an integer number (15484905).

Almost surely, 2^61251313 is an apocalyptic number.

It is an amenable number.

61251313 is a deficient number, since it is larger than the sum of its proper divisors (688307).

61251313 is an equidigital number, since it uses as much as digits as its factorization.

61251313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688306.

The product of its digits is 540, while the sum is 22.

The square root of 61251313 is about 7826.3218052927. The cubic root of 61251313 is about 394.1895748275.

Adding to 61251313 its reverse (31315216), we get a palindrome (92566529).

The spelling of 61251313 in words is "sixty-one million, two hundred fifty-one thousand, three hundred thirteen".