139518097 has 4 divisors (see below), whose sum is σ = 139633956. Its totient is φ = 139402240.

The previous prime is 139518089. The next prime is 139518109. The reversal of 139518097 is 790815931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 79548561 + 59969536 = 8919^2 + 7744^2 .

It is a cyclic number.

It is not a de Polignac number, because 139518097 - 2³ = 139518089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139518017) 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, 56104 + ... + 58537.

It is an arithmetic number, because the mean of its divisors is an integer number (34908489).

Almost surely, 2^139518097 is an apocalyptic number.

It is an amenable number.

139518097 is a deficient number, since it is larger than the sum of its proper divisors (115859).

139518097 is a wasteful number, since it uses less digits than its factorization.

139518097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115858.

The product of its (nonzero) digits is 68040, while the sum is 43.

The square root of 139518097 is about 11811.7778932725. Note that the first 3 decimals coincide. The cubic root of 139518097 is about 518.6529446916.

The spelling of 139518097 in words is "one hundred thirty-nine million, five hundred eighteen thousand, ninety-seven".