61817513 has 2 divisors, whose sum is σ = 61817514. Its totient is φ = 61817512.

The previous prime is 61817489. The next prime is 61817519. The reversal of 61817513 is 31571816.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46199209 + 15618304 = 6797^2 + 3952^2 .

It is a cyclic number.

It is not a de Polignac number, because 61817513 - 2⁶ = 61817449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61817513.

It is not a weakly prime, because it can be changed into another prime (61817519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30908756 + 30908757.

It is an arithmetic number, because the mean of its divisors is an integer number (30908757).

Almost surely, 2^61817513 is an apocalyptic number.

It is an amenable number.

61817513 is a deficient number, since it is larger than the sum of its proper divisors (1).

61817513 is an equidigital number, since it uses as much as digits as its factorization.

61817513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 32.

The square root of 61817513 is about 7862.4113985469. The cubic root of 61817513 is about 395.4004655113.

The spelling of 61817513 in words is "sixty-one million, eight hundred seventeen thousand, five hundred thirteen".