31124642 has 4 divisors (see below), whose sum is σ = 46686966. Its totient is φ = 15562320.

The previous prime is 31124633. The next prime is 31124689. The reversal of 31124642 is 24642113.

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., 17648401 + 13476241 = 4201^2 + 3671^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7781159 + ... + 7781162.

Almost surely, 2^31124642 is an apocalyptic number.

31124642 is a deficient number, since it is larger than the sum of its proper divisors (15562324).

31124642 is a wasteful number, since it uses less digits than its factorization.

31124642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15562323.

The product of its digits is 1152, while the sum is 23.

The square root of 31124642 is about 5578.9463162859. The cubic root of 31124642 is about 314.5585215504.

Adding to 31124642 its reverse (24642113), we get a palindrome (55766755).

The spelling of 31124642 in words is "thirty-one million, one hundred twenty-four thousand, six hundred forty-two".