157721359 has 4 divisors (see below), whose sum is σ = 166999104. Its totient is φ = 148443616.

The previous prime is 157721357. The next prime is 157721407. The reversal of 157721359 is 953127751.

157721359 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 953127751 = 23 ⋅41440337.

It is a cyclic number.

It is not a de Polignac number, because 157721359 - 2¹ = 157721357 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 (157721353) 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, 4638847 + ... + 4638880.

It is an arithmetic number, because the mean of its divisors is an integer number (41749776).

Almost surely, 2^157721359 is an apocalyptic number.

157721359 is a deficient number, since it is larger than the sum of its proper divisors (9277745).

157721359 is an equidigital number, since it uses as much as digits as its factorization.

157721359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9277744.

The product of its digits is 66150, while the sum is 40.

The square root of 157721359 is about 12558.7164551159. The cubic root of 157721359 is about 540.2940316850.

The spelling of 157721359 in words is "one hundred fifty-seven million, seven hundred twenty-one thousand, three hundred fifty-nine".