31421679 has 4 divisors (see below), whose sum is σ = 41895576. Its totient is φ = 20947784.

The previous prime is 31421659. The next prime is 31421683. The reversal of 31421679 is 97612413.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97612413 = 3 ⋅32537471.

It is a cyclic number.

It is not a de Polignac number, because 31421679 - 2⁵ = 31421647 is a prime.

It is a super-2 number, since 2×31421679² = 1974643822358082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31421659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5236944 + ... + 5236949.

It is an arithmetic number, because the mean of its divisors is an integer number (10473894).

Almost surely, 2^31421679 is an apocalyptic number.

31421679 is a deficient number, since it is larger than the sum of its proper divisors (10473897).

31421679 is a wasteful number, since it uses less digits than its factorization.

31421679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10473896.

The product of its digits is 9072, while the sum is 33.

The square root of 31421679 is about 5605.5043484061. The cubic root of 31421679 is about 315.5560147111.

The spelling of 31421679 in words is "thirty-one million, four hundred twenty-one thousand, six hundred seventy-nine".