102731139 has 16 divisors (see below), whose sum is σ = 173936640. Its totient is φ = 58703400.

The previous prime is 102731113. The next prime is 102731149. The reversal of 102731139 is 931137201.

It is not a de Polignac number, because 102731139 - 2⁷ = 102731011 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (102731149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 271587 + ... + 271964.

It is an arithmetic number, because the mean of its divisors is an integer number (10871040).

Almost surely, 2^102731139 is an apocalyptic number.

102731139 is a deficient number, since it is larger than the sum of its proper divisors (71205501).

102731139 is an equidigital number, since it uses as much as digits as its factorization.

102731139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543567 (or 543561 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 27.

The square root of 102731139 is about 10135.6370791381. The cubic root of 102731139 is about 468.3465956514.

The spelling of 102731139 in words is "one hundred two million, seven hundred thirty-one thousand, one hundred thirty-nine".