31317642 has 12 divisors (see below), whose sum is σ = 67854930. Its totient is φ = 10439208.

The previous prime is 31317641. The next prime is 31317653. The reversal of 31317642 is 24671313.

31317642 is a `hidden beast` number, since 3 + 1 + 3 + 17 + 642 = 666.

It can be written as a sum of positive squares in only one way, i.e., 23415921 + 7901721 = 4839^2 + 2811^2 .

It is not an unprimeable number, because it can be changed into a prime (31317641) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 869917 + ... + 869952.

Almost surely, 2^31317642 is an apocalyptic number.

31317642 is an abundant number, since it is smaller than the sum of its proper divisors (36537288).

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

31317642 is a wasteful number, since it uses less digits than its factorization.

31317642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1739877 (or 1739874 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 31317642 is about 5596.2167577748. The cubic root of 31317642 is about 315.2073615762.

Adding to 31317642 its reverse (24671313), we get a palindrome (55988955).

It can be divided in two parts, 313 and 17642, that added together give a triangular number (17955 = T₁₈₉).

The spelling of 31317642 in words is "thirty-one million, three hundred seventeen thousand, six hundred forty-two".