31487421 has 16 divisors (see below), whose sum is σ = 48162944. Its totient is φ = 17924544.

The previous prime is 31487419. The next prime is 31487447. The reversal of 31487421 is 12478413.

It is not a de Polignac number, because 31487421 - 2¹ = 31487419 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31487411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3111 + ... + 8523.

It is an arithmetic number, because the mean of its divisors is an integer number (3010184).

Almost surely, 2^31487421 is an apocalyptic number.

It is an amenable number.

31487421 is a deficient number, since it is larger than the sum of its proper divisors (16675523).

31487421 is a wasteful number, since it uses less digits than its factorization.

31487421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5700.

The product of its digits is 5376, while the sum is 30.

The square root of 31487421 is about 5611.3653418754. The cubic root of 31487421 is about 315.7759354035.

The spelling of 31487421 in words is "thirty-one million, four hundred eighty-seven thousand, four hundred twenty-one".