157155109 has 4 divisors (see below), whose sum is σ = 157657516. Its totient is φ = 156652704.

The previous prime is 157155101. The next prime is 157155127. The reversal of 157155109 is 901551751.

It is a happy number.

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 3940225 + 153214884 = 1985^2 + 12378^2 .

It is a cyclic number.

It is not a de Polignac number, because 157155109 - 2³ = 157155101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157155101) 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, 250734 + ... + 251359.

It is an arithmetic number, because the mean of its divisors is an integer number (39414379).

Almost surely, 2^157155109 is an apocalyptic number.

It is an amenable number.

157155109 is a deficient number, since it is larger than the sum of its proper divisors (502407).

157155109 is an equidigital number, since it uses as much as digits as its factorization.

157155109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502406.

The product of its (nonzero) digits is 7875, while the sum is 34.

The square root of 157155109 is about 12536.1520810813. The cubic root of 157155109 is about 539.6466698671.

The spelling of 157155109 in words is "one hundred fifty-seven million, one hundred fifty-five thousand, one hundred nine".