108213731 has 4 divisors (see below), whose sum is σ = 108378600. Its totient is φ = 108048864.

The previous prime is 108213713. The next prime is 108213737. The reversal of 108213731 is 137312801.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 137312801 = 587 ⋅233923.

It is a cyclic number.

It is not a de Polignac number, because 108213731 - 2¹⁸ = 107951587 is a prime.

It is a super-2 number, since 2×108213731² = 23420423153880722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 108213731.

It is not an unprimeable number, because it can be changed into a prime (108213737) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81446 + ... + 82763.

It is an arithmetic number, because the mean of its divisors is an integer number (27094650).

Almost surely, 2^108213731 is an apocalyptic number.

108213731 is a deficient number, since it is larger than the sum of its proper divisors (164869).

108213731 is an equidigital number, since it uses as much as digits as its factorization.

108213731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164868.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 108213731 is about 10402.5829004147. The cubic root of 108213731 is about 476.5342537862.

The spelling of 108213731 in words is "one hundred eight million, two hundred thirteen thousand, seven hundred thirty-one".