31355442 has 12 divisors (see below), whose sum is σ = 67936830. Its totient is φ = 10451808.

The previous prime is 31355437. The next prime is 31355449. The reversal of 31355442 is 24455313.

It can be written as a sum of positive squares in only one way, i.e., 27973521 + 3381921 = 5289^2 + 1839^2 .

It is not an unprimeable number, because it can be changed into a prime (31355449) 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, 870967 + ... + 871002.

Almost surely, 2^31355442 is an apocalyptic number.

31355442 is an abundant number, since it is smaller than the sum of its proper divisors (36581388).

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

31355442 is a wasteful number, since it uses less digits than its factorization.

31355442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1741977 (or 1741974 counting only the distinct ones).

The product of its digits is 7200, while the sum is 27.

The square root of 31355442 is about 5599.5930209257. The cubic root of 31355442 is about 315.3341276951.

It can be divided in two parts, 313 and 55442, that added together give a palindrome (55755).

The spelling of 31355442 in words is "thirty-one million, three hundred fifty-five thousand, four hundred forty-two".