31427289 has 12 divisors (see below), whose sum is σ = 45444672. Its totient is φ = 20928600.

The previous prime is 31427267. The next prime is 31427327. The reversal of 31427289 is 98272413.

It is not a de Polignac number, because 31427289 - 2¹³ = 31419097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31427239) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12444 + ... + 14754.

It is an arithmetic number, because the mean of its divisors is an integer number (3787056).

Almost surely, 2^31427289 is an apocalyptic number.

It is an amenable number.

31427289 is a deficient number, since it is larger than the sum of its proper divisors (14017383).

31427289 is a wasteful number, since it uses less digits than its factorization.

31427289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3828 (or 3825 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 31427289 is about 5606.0047270761. The cubic root of 31427289 is about 315.5747932949.

The spelling of 31427289 in words is "thirty-one million, four hundred twenty-seven thousand, two hundred eighty-nine".