31172242 has 4 divisors (see below), whose sum is σ = 46758366. Its totient is φ = 15586120.

The previous prime is 31172209. The next prime is 31172243. The reversal of 31172242 is 24227113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24227113 = 179 ⋅135347.

It can be written as a sum of positive squares in only one way, i.e., 25512601 + 5659641 = 5051^2 + 2379^2 .

It is not an unprimeable number, because it can be changed into a prime (31172243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7793059 + ... + 7793062.

Almost surely, 2^31172242 is an apocalyptic number.

31172242 is a deficient number, since it is larger than the sum of its proper divisors (15586124).

31172242 is a wasteful number, since it uses less digits than its factorization.

31172242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15586123.

The product of its digits is 672, while the sum is 22.

The square root of 31172242 is about 5583.2107250219. The cubic root of 31172242 is about 314.7187949783.

Adding to 31172242 its reverse (24227113), we get a palindrome (55399355).

The spelling of 31172242 in words is "thirty-one million, one hundred seventy-two thousand, two hundred forty-two".