139291157 has 4 divisors (see below), whose sum is σ = 139474956. Its totient is φ = 139107360.

The previous prime is 139291133. The next prime is 139291169. The reversal of 139291157 is 751192931.

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 192721 + 139098436 = 439^2 + 11794^2 .

It is a cyclic number.

It is not a de Polignac number, because 139291157 - 2⁸ = 139290901 is a prime.

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 139291157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139293157) 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, 90758 + ... + 92279.

It is an arithmetic number, because the mean of its divisors is an integer number (34868739).

Almost surely, 2^139291157 is an apocalyptic number.

It is an amenable number.

139291157 is a deficient number, since it is larger than the sum of its proper divisors (183799).

139291157 is an equidigital number, since it uses as much as digits as its factorization.

139291157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183798.

The product of its digits is 17010, while the sum is 38.

The square root of 139291157 is about 11802.1674704268. The cubic root of 139291157 is about 518.3715786224.

The spelling of 139291157 in words is "one hundred thirty-nine million, two hundred ninety-one thousand, one hundred fifty-seven".