61757257 has 2 divisors, whose sum is σ = 61757258. Its totient is φ = 61757256.

The previous prime is 61757249. The next prime is 61757261. The reversal of 61757257 is 75275716.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56987401 + 4769856 = 7549^2 + 2184^2 .

It is a cyclic number.

It is not a de Polignac number, because 61757257 - 2³ = 61757249 is a prime.

It is not a weakly prime, because it can be changed into another prime (61757287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30878628 + 30878629.

It is an arithmetic number, because the mean of its divisors is an integer number (30878629).

Almost surely, 2^61757257 is an apocalyptic number.

It is an amenable number.

61757257 is a deficient number, since it is larger than the sum of its proper divisors (1).

61757257 is an equidigital number, since it uses as much as digits as its factorization.

61757257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 102900, while the sum is 40.

The square root of 61757257 is about 7858.5785610376. The cubic root of 61757257 is about 395.2719528691.

The spelling of 61757257 in words is "sixty-one million, seven hundred fifty-seven thousand, two hundred fifty-seven".