61210657 has 2 divisors, whose sum is σ = 61210658. Its totient is φ = 61210656.

The previous prime is 61210649. The next prime is 61210673. The reversal of 61210657 is 75601216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38638656 + 22572001 = 6216^2 + 4751^2 .

It is a cyclic number.

It is not a de Polignac number, because 61210657 - 2³ = 61210649 is a prime.

It is not a weakly prime, because it can be changed into another prime (61210697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30605328 + 30605329.

It is an arithmetic number, because the mean of its divisors is an integer number (30605329).

Almost surely, 2^61210657 is an apocalyptic number.

It is an amenable number.

61210657 is a deficient number, since it is larger than the sum of its proper divisors (1).

61210657 is an equidigital number, since it uses as much as digits as its factorization.

61210657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 61210657 is about 7823.7239854177. The cubic root of 61210657 is about 394.1023401343.

The spelling of 61210657 in words is "sixty-one million, two hundred ten thousand, six hundred fifty-seven".