31421356 has 6 divisors (see below), whose sum is σ = 54987380. Its totient is φ = 15710676.

The previous prime is 31421329. The next prime is 31421387. The reversal of 31421356 is 65312413.

It is a super-2 number, since 2×31421356² = 1974603225757472, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31421356.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3927666 + ... + 3927673.

Almost surely, 2^31421356 is an apocalyptic number.

It is an amenable number.

31421356 is a deficient number, since it is larger than the sum of its proper divisors (23566024).

31421356 is a wasteful number, since it uses less digits than its factorization.

31421356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7855343 (or 7855341 counting only the distinct ones).

The product of its digits is 2160, while the sum is 25.

The square root of 31421356 is about 5605.4755373652. The cubic root of 31421356 is about 315.5549334519.

Adding to 31421356 its reverse (65312413), we get a palindrome (96733769).

The spelling of 31421356 in words is "thirty-one million, four hundred twenty-one thousand, three hundred fifty-six".