61817251 has 2 divisors, whose sum is σ = 61817252. Its totient is φ = 61817250.

The previous prime is 61817237. The next prime is 61817291. The reversal of 61817251 is 15271816.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61817251 - 2⁹ = 61816739 is a prime.

It is not a weakly prime, because it can be changed into another prime (61817291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30908625 + 30908626.

It is an arithmetic number, because the mean of its divisors is an integer number (30908626).

Almost surely, 2^61817251 is an apocalyptic number.

61817251 is a deficient number, since it is larger than the sum of its proper divisors (1).

61817251 is an equidigital number, since it uses as much as digits as its factorization.

61817251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3360, while the sum is 31.

The square root of 61817251 is about 7862.3947369742. The cubic root of 61817251 is about 395.3999069044.

The spelling of 61817251 in words is "sixty-one million, eight hundred seventeen thousand, two hundred fifty-one".