6642931 has 4 divisors (see below), whose sum is σ = 6701832. Its totient is φ = 6584032.

The previous prime is 6642919. The next prime is 6642991. The reversal of 6642931 is 1392466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6642931 - 2⁷ = 6642803 is a prime.

It is a super-2 number, since 2×6642931² = 88257064541522, which contains 22 as substring.

It is a d-powerful number, because it can be written as 6 + 6⁷ + 4¹⁰ + 2 + 9⁶ + 3¹⁴ + 1 .

It is a Duffinian number.

6642931 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 6642893 and 6642902.

It is not an unprimeable number, because it can be changed into a prime (6642991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29281 + ... + 29506.

It is an arithmetic number, because the mean of its divisors is an integer number (1675458).

Almost surely, 2^6642931 is an apocalyptic number.

6642931 is a deficient number, since it is larger than the sum of its proper divisors (58901).

6642931 is a wasteful number, since it uses less digits than its factorization.

6642931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58900.

The product of its digits is 7776, while the sum is 31.

The square root of 6642931 is about 2577.3884068956. The cubic root of 6642931 is about 187.9835789943.

The spelling of 6642931 in words is "six million, six hundred forty-two thousand, nine hundred thirty-one".