31205442 has 16 divisors (see below), whose sum is σ = 62488512. Its totient is φ = 10388880.

The previous prime is 31205441. The next prime is 31205443. The reversal of 31205442 is 24450213.

It is an interprime number because it is at equal distance from previous prime (31205441) and next prime (31205443).

It is a super-2 number, since 2×31205442² = 1947559220830728, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31205441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2883 + ... + 8409.

It is an arithmetic number, because the mean of its divisors is an integer number (3905532).

Almost surely, 2^31205442 is an apocalyptic number.

31205442 is an abundant number, since it is smaller than the sum of its proper divisors (31283070).

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

31205442 is a wasteful number, since it uses less digits than its factorization.

31205442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6473.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 31205442 is about 5586.1831334105. The cubic root of 31205442 is about 314.8304857654.

Adding to 31205442 its reverse (24450213), we get a palindrome (55655655).

The spelling of 31205442 in words is "thirty-one million, two hundred five thousand, four hundred forty-two".