31426513 has 4 divisors (see below), whose sum is σ = 33080560. Its totient is φ = 29772468.

The previous prime is 31426511. The next prime is 31426559. The reversal of 31426513 is 31562413.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31562413 = 233 ⋅135461.

It is not a de Polignac number, because 31426513 - 2¹ = 31426511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31426511) 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, 826995 + ... + 827032.

It is an arithmetic number, because the mean of its divisors is an integer number (8270140).

Almost surely, 2^31426513 is an apocalyptic number.

It is an amenable number.

31426513 is a deficient number, since it is larger than the sum of its proper divisors (1654047).

31426513 is a wasteful number, since it uses less digits than its factorization.

31426513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1654046.

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

The square root of 31426513 is about 5605.9355151482. The cubic root of 31426513 is about 315.5721958914.

Adding to 31426513 its reverse (31562413), we get a palindrome (62988926).

The spelling of 31426513 in words is "thirty-one million, four hundred twenty-six thousand, five hundred thirteen".