6401971 has 2 divisors, whose sum is σ = 6401972. Its totient is φ = 6401970.

The previous prime is 6401963. The next prime is 6401977. The reversal of 6401971 is 1791046.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6401971 - 2³ = 6401963 is a prime.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (6401977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3200985 + 3200986.

It is an arithmetic number, because the mean of its divisors is an integer number (3200986).

Almost surely, 2^6401971 is an apocalyptic number.

6401971 is a deficient number, since it is larger than the sum of its proper divisors (1).

6401971 is an equidigital number, since it uses as much as digits as its factorization.

6401971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 6401971 is about 2530.2116512260. The cubic root of 6401971 is about 185.6826109124.

The spelling of 6401971 in words is "six million, four hundred one thousand, nine hundred seventy-one".