31742621 has 4 divisors (see below), whose sum is σ = 33609852. Its totient is φ = 29875392.

The previous prime is 31742611. The next prime is 31742647. The reversal of 31742621 is 12624713.

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

It can be written as a sum of positive squares in 2 ways, for example, as 22372900 + 9369721 = 4730^2 + 3061^2 .

It is not a de Polignac number, because 31742621 - 2²² = 27548317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31742611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 933590 + ... + 933623.

It is an arithmetic number, because the mean of its divisors is an integer number (8402463).

Almost surely, 2^31742621 is an apocalyptic number.

It is an amenable number.

31742621 is a deficient number, since it is larger than the sum of its proper divisors (1867231).

31742621 is a wasteful number, since it uses less digits than its factorization.

31742621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1867230.

The product of its digits is 2016, while the sum is 26.

The square root of 31742621 is about 5634.0590163753. The cubic root of 31742621 is about 316.6267437513.

The spelling of 31742621 in words is "thirty-one million, seven hundred forty-two thousand, six hundred twenty-one".