505940657 has 2 divisors, whose sum is σ = 505940658. Its totient is φ = 505940656.

The previous prime is 505940629. The next prime is 505940681. The reversal of 505940657 is 756049505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 279257521 + 226683136 = 16711^2 + 15056^2 .

It is a cyclic number.

It is not a de Polignac number, because 505940657 - 2⁶ = 505940593 is a prime.

It is not a weakly prime, because it can be changed into another prime (505940857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252970328 + 252970329.

It is an arithmetic number, because the mean of its divisors is an integer number (252970329).

Almost surely, 2^505940657 is an apocalyptic number.

It is an amenable number.

505940657 is a deficient number, since it is larger than the sum of its proper divisors (1).

505940657 is an equidigital number, since it uses as much as digits as its factorization.

505940657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 189000, while the sum is 41.

The square root of 505940657 is about 22493.1246606602. The cubic root of 505940657 is about 796.8315599890.

The spelling of 505940657 in words is "five hundred five million, nine hundred forty thousand, six hundred fifty-seven".