31004542 has 16 divisors (see below), whose sum is σ = 49064400. Its totient is φ = 14653440.

The previous prime is 31004513. The next prime is 31004543. The reversal of 31004542 is 24540013.

It is a super-2 number, since 2×31004542² = 1922563249259528, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31004543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28692 + ... + 29752.

It is an arithmetic number, because the mean of its divisors is an integer number (3066525).

Almost surely, 2^31004542 is an apocalyptic number.

31004542 is a deficient number, since it is larger than the sum of its proper divisors (18059858).

31004542 is a wasteful number, since it uses less digits than its factorization.

31004542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1851.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 31004542 is about 5568.1722315316. The cubic root of 31004542 is about 314.1534065877.

Adding to 31004542 its reverse (24540013), we get a palindrome (55544555).

The spelling of 31004542 in words is "thirty-one million, four thousand, five hundred forty-two".