31312426 has 4 divisors (see below), whose sum is σ = 46968642. Its totient is φ = 15656212.

The previous prime is 31312423. The next prime is 31312433. The reversal of 31312426 is 62421313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62421313 = 113 ⋅552401.

It can be written as a sum of positive squares in only one way, i.e., 23184225 + 8128201 = 4815^2 + 2851^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31312397 and 31312406.

It is not an unprimeable number, because it can be changed into a prime (31312423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7828105 + ... + 7828108.

Almost surely, 2^31312426 is an apocalyptic number.

31312426 is a deficient number, since it is larger than the sum of its proper divisors (15656216).

31312426 is a wasteful number, since it uses less digits than its factorization.

31312426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15656215.

The product of its digits is 864, while the sum is 22.

The square root of 31312426 is about 5595.7507092436. The cubic root of 31312426 is about 315.1898611858.

Adding to 31312426 its reverse (62421313), we get a palindrome (93733739).

The spelling of 31312426 in words is "thirty-one million, three hundred twelve thousand, four hundred twenty-six".