31105042 has 4 divisors (see below), whose sum is σ = 46657566. Its totient is φ = 15552520.

The previous prime is 31105027. The next prime is 31105051. The reversal of 31105042 is 24050113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24050113 = 241 ⋅99793.

It can be written as a sum of positive squares in only one way, i.e., 28611801 + 2493241 = 5349^2 + 1579^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7776259 + ... + 7776262.

Almost surely, 2^31105042 is an apocalyptic number.

31105042 is a deficient number, since it is larger than the sum of its proper divisors (15552524).

31105042 is a wasteful number, since it uses less digits than its factorization.

31105042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15552523.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 31105042 is about 5577.1894355491. The cubic root of 31105042 is about 314.4924791132.

Adding to 31105042 its reverse (24050113), we get a palindrome (55155155).

The spelling of 31105042 in words is "thirty-one million, one hundred five thousand, forty-two".