157821955 has 4 divisors (see below), whose sum is σ = 189386352. Its totient is φ = 126257560.

The previous prime is 157821953. The next prime is 157821959. The reversal of 157821955 is 559128751.

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

It is not a de Polignac number, because 157821955 - 2¹ = 157821953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157821953) 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, 15782191 + ... + 15782200.

It is an arithmetic number, because the mean of its divisors is an integer number (47346588).

Almost surely, 2^157821955 is an apocalyptic number.

157821955 is a deficient number, since it is larger than the sum of its proper divisors (31564397).

157821955 is an equidigital number, since it uses as much as digits as its factorization.

157821955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31564396.

The product of its digits is 126000, while the sum is 43.

The square root of 157821955 is about 12562.7208438300. The cubic root of 157821955 is about 540.4088752877.

The spelling of 157821955 in words is "one hundred fifty-seven million, eight hundred twenty-one thousand, nine hundred fifty-five".