6401587 has 2 divisors, whose sum is σ = 6401588. Its totient is φ = 6401586.

The previous prime is 6401579. The next prime is 6401609. The reversal of 6401587 is 7851046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6401587 - 2³ = 6401579 is a prime.

It is a super-2 number, since 2×6401587² = 81960632237138, which contains 22 as substring.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (6401557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3200793 + 3200794.

It is an arithmetic number, because the mean of its divisors is an integer number (3200794).

Almost surely, 2^6401587 is an apocalyptic number.

6401587 is a deficient number, since it is larger than the sum of its proper divisors (1).

6401587 is an equidigital number, since it uses as much as digits as its factorization.

6401587 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 6401587 is about 2530.1357671082. The cubic root of 6401587 is about 185.6788983293.

The spelling of 6401587 in words is "six million, four hundred one thousand, five hundred eighty-seven".