61642457 has 2 divisors, whose sum is σ = 61642458. Its totient is φ = 61642456.

The previous prime is 61642453. The next prime is 61642501. The reversal of 61642457 is 75424616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39702601 + 21939856 = 6301^2 + 4684^2 .

It is a cyclic number.

It is not a de Polignac number, because 61642457 - 2² = 61642453 is a prime.

It is not a weakly prime, because it can be changed into another prime (61642453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30821228 + 30821229.

It is an arithmetic number, because the mean of its divisors is an integer number (30821229).

Almost surely, 2^61642457 is an apocalyptic number.

It is an amenable number.

61642457 is a deficient number, since it is larger than the sum of its proper divisors (1).

61642457 is an equidigital number, since it uses as much as digits as its factorization.

61642457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 35.

The square root of 61642457 is about 7851.2710435954. The cubic root of 61642457 is about 395.0268784786.

The spelling of 61642457 in words is "sixty-one million, six hundred forty-two thousand, four hundred fifty-seven".