651461977 has 2 divisors, whose sum is σ = 651461978. Its totient is φ = 651461976.

The previous prime is 651461969. The next prime is 651461999. The reversal of 651461977 is 779164156.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 604963216 + 46498761 = 24596^2 + 6819^2 .

It is a cyclic number.

It is not a de Polignac number, because 651461977 - 2³ = 651461969 is a prime.

It is not a weakly prime, because it can be changed into another prime (651461917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325730988 + 325730989.

It is an arithmetic number, because the mean of its divisors is an integer number (325730989).

Almost surely, 2^651461977 is an apocalyptic number.

It is an amenable number.

651461977 is a deficient number, since it is larger than the sum of its proper divisors (1).

651461977 is an equidigital number, since it uses as much as digits as its factorization.

651461977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 317520, while the sum is 46.

The square root of 651461977 is about 25523.7531918799. The cubic root of 651461977 is about 866.8880660366. Note that the first 3 decimals are identical.

The spelling of 651461977 in words is "six hundred fifty-one million, four hundred sixty-one thousand, nine hundred seventy-seven".