31105442 has 8 divisors (see below), whose sum is σ = 46729116. Its totient is φ = 15529072.

The previous prime is 31105423. The next prime is 31105457. The reversal of 31105442 is 24450113.

It can be written as a sum of positive squares in 2 ways, for example, as 26615281 + 4490161 = 5159^2 + 2119^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10133 + ... + 12840.

Almost surely, 2^31105442 is an apocalyptic number.

31105442 is a deficient number, since it is larger than the sum of its proper divisors (15623674).

31105442 is a wasteful number, since it uses less digits than its factorization.

31105442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23652.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 31105442 is about 5577.2252957900. The cubic root of 31105442 is about 314.4938271954.

Adding to 31105442 its reverse (24450113), we get a palindrome (55555555).

The spelling of 31105442 in words is "thirty-one million, one hundred five thousand, four hundred forty-two".