157249523209 has 3 divisors (see below), whose sum is σ = 157249919757. Its totient is φ = 157249126662.

The previous prime is 157249523177. The next prime is 157249523219. The reversal of 157249523209 is 902325942751.

The square root of 157249523209 is 396547.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 157249523209 - 2⁵ = 157249523177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157249523219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 198274 + ... + 594820.

It is an arithmetic number, because the mean of its divisors is an integer number (52416639919).

Almost surely, 2^157249523209 is an apocalyptic number.

157249523209 is the 396547-th square number.

157249523209 is the 198274-th centered octagonal number.

It is an amenable number.

157249523209 is a deficient number, since it is larger than the sum of its proper divisors (396548).

157249523209 is an frugal number, since it uses more digits than its factorization.

157249523209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 793094 (or 396547 counting only the distinct ones).

The product of its (nonzero) digits is 1360800, while the sum is 49.

Multiplying 157249523209 by its sum of digits (49), we get a square (7705226637241 = 2775829²).

The spelling of 157249523209 in words is "one hundred fifty-seven billion, two hundred forty-nine million, five hundred twenty-three thousand, two hundred nine".