6401977 has 2 divisors, whose sum is σ = 6401978. Its totient is φ = 6401976.

The previous prime is 6401971. The next prime is 6401987. The reversal of 6401977 is 7791046.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3370896 + 3031081 = 1836^2 + 1741^2 .

It is a cyclic number.

It is not a de Polignac number, because 6401977 - 2⁷ = 6401849 is a prime.

It is not a weakly prime, because it can be changed into another prime (6401971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3200988 + 3200989.

It is an arithmetic number, because the mean of its divisors is an integer number (3200989).

Almost surely, 2^6401977 is an apocalyptic number.

It is an amenable number.

6401977 is a deficient number, since it is larger than the sum of its proper divisors (1).

6401977 is an equidigital number, since it uses as much as digits as its factorization.

6401977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 6401977 is about 2530.2128368973. The cubic root of 6401977 is about 185.6826689203.

The spelling of 6401977 in words is "six million, four hundred one thousand, nine hundred seventy-seven".