31143426 has 32 divisors (see below), whose sum is σ = 65802240. Its totient is φ = 9806544.

The previous prime is 31143407. The next prime is 31143433. The reversal of 31143426 is 62434113.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31143396 and 31143405.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10095 + ... + 12813.

It is an arithmetic number, because the mean of its divisors is an integer number (2056320).

Almost surely, 2^31143426 is an apocalyptic number.

31143426 is the 3530-th centered pentagonal number.

31143426 is an abundant number, since it is smaller than the sum of its proper divisors (34658814).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31143426 is a wasteful number, since it uses less digits than its factorization.

31143426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2830.

The product of its digits is 1728, while the sum is 24.

The square root of 31143426 is about 5580.6295343805. The cubic root of 31143426 is about 314.6217884523.

Adding to 31143426 its reverse (62434113), we get a palindrome (93577539).

The spelling of 31143426 in words is "thirty-one million, one hundred forty-three thousand, four hundred twenty-six".