31387054 has 4 divisors (see below), whose sum is σ = 47080584. Its totient is φ = 15693526.

The previous prime is 31387051. The next prime is 31387061. The reversal of 31387054 is 45078313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45078313 = 7 ⋅6439759.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31387051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7846762 + ... + 7846765.

It is an arithmetic number, because the mean of its divisors is an integer number (11770146).

Almost surely, 2^31387054 is an apocalyptic number.

31387054 is a deficient number, since it is larger than the sum of its proper divisors (15693530).

31387054 is a wasteful number, since it uses less digits than its factorization.

31387054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15693529.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 31387054 is about 5602.4150149735. The cubic root of 31387054 is about 315.4400635255.

The spelling of 31387054 in words is "thirty-one million, three hundred eighty-seven thousand, fifty-four".