31013442 has 20 divisors (see below), whose sum is σ = 69493446. Its totient is φ = 10337760.

The previous prime is 31013431. The next prime is 31013461. The reversal of 31013442 is 24431013.

It can be written as a sum of positive squares in only one way, i.e., 22667121 + 8346321 = 4761^2 + 2889^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 95559 + ... + 95882.

Almost surely, 2^31013442 is an apocalyptic number.

31013442 is an abundant number, since it is smaller than the sum of its proper divisors (38480004).

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

31013442 is a wasteful number, since it uses less digits than its factorization.

31013442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191455 (or 191446 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 31013442 is about 5568.9713592368. The cubic root of 31013442 is about 314.1834634508.

Adding to 31013442 its reverse (24431013), we get a palindrome (55444455).

The spelling of 31013442 in words is "thirty-one million, thirteen thousand, four hundred forty-two".