31147389 has 48 divisors (see below), whose sum is σ = 57839040. Its totient is φ = 16420320.

The previous prime is 31147381. The next prime is 31147397. The reversal of 31147389 is 98374113.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (31147381) and next prime (31147397).

It is not a de Polignac number, because 31147389 - 2³ = 31147381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31147381) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16294 + ... + 18104.

It is an arithmetic number, because the mean of its divisors is an integer number (1204980).

Almost surely, 2^31147389 is an apocalyptic number.

31147389 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

It is an amenable number.

31147389 is a deficient number, since it is larger than the sum of its proper divisors (26691651).

31147389 is a wasteful number, since it uses less digits than its factorization.

31147389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1847 (or 1834 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 31147389 is about 5580.9845905539. The cubic root of 31147389 is about 314.6351330906.

The spelling of 31147389 in words is "thirty-one million, one hundred forty-seven thousand, three hundred eighty-nine".