31748138987 has 8 divisors (see below), whose sum is σ = 33139997856. Its totient is φ = 30357238912.

The previous prime is 31748138969. The next prime is 31748139011. The reversal of 31748138987 is 78983184713.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31748138987 - 2¹⁴ = 31748122603 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31748138087) 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, 171608 + ... + 304869.

It is an arithmetic number, because the mean of its divisors is an integer number (4142499732).

Almost surely, 2^31748138987 is an apocalyptic number.

31748138987 is a deficient number, since it is larger than the sum of its proper divisors (1391858869).

31748138987 is a wasteful number, since it uses less digits than its factorization.

31748138987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479397.

The product of its digits is 8128512, while the sum is 59.

The spelling of 31748138987 in words is "thirty-one billion, seven hundred forty-eight million, one hundred thirty-eight thousand, nine hundred eighty-seven".