61556051 has 2 divisors, whose sum is σ = 61556052. Its totient is φ = 61556050.

The previous prime is 61556039. The next prime is 61556059. The reversal of 61556051 is 15065516.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61556051 - 2¹⁰ = 61555027 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (61556059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30778025 + 30778026.

It is an arithmetic number, because the mean of its divisors is an integer number (30778026).

Almost surely, 2^61556051 is an apocalyptic number.

61556051 is a deficient number, since it is larger than the sum of its proper divisors (1).

61556051 is an equidigital number, since it uses as much as digits as its factorization.

61556051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 61556051 is about 7845.7664380225. The cubic root of 61556051 is about 394.8422186688.

The spelling of 61556051 in words is "sixty-one million, five hundred fifty-six thousand, fifty-one".