61551157 has 2 divisors, whose sum is σ = 61551158. Its totient is φ = 61551156.

The previous prime is 61551131. The next prime is 61551167. The reversal of 61551157 is 75115516.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60855601 + 695556 = 7801^2 + 834^2 .

It is a cyclic number.

It is not a de Polignac number, because 61551157 - 2⁷ = 61551029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61551167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30775578 + 30775579.

It is an arithmetic number, because the mean of its divisors is an integer number (30775579).

Almost surely, 2^61551157 is an apocalyptic number.

It is an amenable number.

61551157 is a deficient number, since it is larger than the sum of its proper divisors (1).

61551157 is an equidigital number, since it uses as much as digits as its factorization.

61551157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5250, while the sum is 31.

The square root of 61551157 is about 7845.4545438744. The cubic root of 61551157 is about 394.8317544442.

The spelling of 61551157 in words is "sixty-one million, five hundred fifty-one thousand, one hundred fifty-seven".