157145809 has 8 divisors (see below), whose sum is σ = 164525760. Its totient is φ = 149896656.

The previous prime is 157145801. The next prime is 157145819. The reversal of 157145809 is 908541751.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 157145809 - 2³ = 157145801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157145801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30237 + ... + 35050.

It is an arithmetic number, because the mean of its divisors is an integer number (20565720).

Almost surely, 2^157145809 is an apocalyptic number.

It is an amenable number.

157145809 is a deficient number, since it is larger than the sum of its proper divisors (7379951).

157145809 is an equidigital number, since it uses as much as digits as its factorization.

157145809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65399.

The product of its (nonzero) digits is 50400, while the sum is 40.

The square root of 157145809 is about 12535.7811483768. The cubic root of 157145809 is about 539.6360247301.

The spelling of 157145809 in words is "one hundred fifty-seven million, one hundred forty-five thousand, eight hundred nine".