31242373 has 4 divisors (see below), whose sum is σ = 31434208. Its totient is φ = 31050540.

The previous prime is 31242347. The next prime is 31242377. The reversal of 31242373 is 37324213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 37324213 = 103 ⋅362371.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31242373 is a prime.

It is a super-2 number, since 2×31242373² = 1952171741342258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31242377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95673 + ... + 95998.

It is an arithmetic number, because the mean of its divisors is an integer number (7858552).

Almost surely, 2^31242373 is an apocalyptic number.

It is an amenable number.

31242373 is a deficient number, since it is larger than the sum of its proper divisors (191835).

31242373 is a wasteful number, since it uses less digits than its factorization.

31242373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191834.

The product of its digits is 3024, while the sum is 25.

The square root of 31242373 is about 5589.4877225019. The cubic root of 31242373 is about 314.9546352745.

Adding to 31242373 its reverse (37324213), we get a palindrome (68566586).

The spelling of 31242373 in words is "thirty-one million, two hundred forty-two thousand, three hundred seventy-three".