61537313 has 2 divisors, whose sum is σ = 61537314. Its totient is φ = 61537312.

The previous prime is 61537309. The next prime is 61537339. The reversal of 61537313 is 31373516.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45792289 + 15745024 = 6767^2 + 3968^2 .

It is a cyclic number.

It is not a de Polignac number, because 61537313 - 2² = 61537309 is a prime.

It is not a weakly prime, because it can be changed into another prime (61537363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30768656 + 30768657.

It is an arithmetic number, because the mean of its divisors is an integer number (30768657).

Almost surely, 2^61537313 is an apocalyptic number.

It is an amenable number.

61537313 is a deficient number, since it is larger than the sum of its proper divisors (1).

61537313 is an equidigital number, since it uses as much as digits as its factorization.

61537313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5670, while the sum is 29.

The square root of 61537313 is about 7844.5721999354. The cubic root of 61537313 is about 394.8021505563.

The spelling of 61537313 in words is "sixty-one million, five hundred thirty-seven thousand, three hundred thirteen".