157723609 has 4 divisors (see below), whose sum is σ = 157751604. Its totient is φ = 157695616.

The previous prime is 157723571. The next prime is 157723633. The reversal of 157723609 is 906327751.

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 38477209 + 119246400 = 6203^2 + 10920^2 .

It is a cyclic number.

It is not a de Polignac number, because 157723609 - 2¹¹ = 157721561 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157723639) 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, 2272 + ... + 17905.

It is an arithmetic number, because the mean of its divisors is an integer number (39437901).

Almost surely, 2^157723609 is an apocalyptic number.

It is an amenable number.

157723609 is a deficient number, since it is larger than the sum of its proper divisors (27995).

157723609 is an equidigital number, since it uses as much as digits as its factorization.

157723609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27994.

The product of its (nonzero) digits is 79380, while the sum is 40.

The square root of 157723609 is about 12558.8060340145. The cubic root of 157723609 is about 540.2966008906.

The spelling of 157723609 in words is "one hundred fifty-seven million, seven hundred twenty-three thousand, six hundred nine".