61810457 has 2 divisors, whose sum is σ = 61810458. Its totient is φ = 61810456.

The previous prime is 61810451. The next prime is 61810481. The reversal of 61810457 is 75401816.

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., 55071241 + 6739216 = 7421^2 + 2596^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61810457 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61810451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30905228 + 30905229.

It is an arithmetic number, because the mean of its divisors is an integer number (30905229).

Almost surely, 2^61810457 is an apocalyptic number.

It is an amenable number.

61810457 is a deficient number, since it is larger than the sum of its proper divisors (1).

61810457 is an equidigital number, since it uses as much as digits as its factorization.

61810457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 61810457 is about 7861.9626684435. The cubic root of 61810457 is about 395.3854209514.

The spelling of 61810457 in words is "sixty-one million, eight hundred ten thousand, four hundred fifty-seven".