31230223042 has 4 divisors (see below), whose sum is σ = 46845334566. Its totient is φ = 15615111520.

The previous prime is 31230223039. The next prime is 31230223043. The reversal of 31230223042 is 24032203213.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 30318122641 + 912100401 = 174121^2 + 30201^2 .

It is not an unprimeable number, because it can be changed into a prime (31230223043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7807555759 + ... + 7807555762.

Almost surely, 2^31230223042 is an apocalyptic number.

31230223042 is a deficient number, since it is larger than the sum of its proper divisors (15615111524).

31230223042 is a wasteful number, since it uses less digits than its factorization.

31230223042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15615111523.

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 31230223042 its reverse (24032203213), we get a palindrome (55262426255).

The spelling of 31230223042 in words is "thirty-one billion, two hundred thirty million, two hundred twenty-three thousand, forty-two".