157721361 has 16 divisors (see below), whose sum is σ = 240537600. Its totient is φ = 90051408.

The previous prime is 157721357. The next prime is 157721407. The reversal of 157721361 is 163127751.

It is not a de Polignac number, because 157721361 - 2² = 157721357 is a prime.

It is not an unprimeable number, because it can be changed into a prime (157721341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31680 + ... + 36318.

It is an arithmetic number, because the mean of its divisors is an integer number (15033600).

Almost surely, 2^157721361 is an apocalyptic number.

It is an amenable number.

157721361 is a deficient number, since it is larger than the sum of its proper divisors (82816239).

157721361 is a wasteful number, since it uses less digits than its factorization.

157721361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6268.

The product of its digits is 8820, while the sum is 33.

The square root of 157721361 is about 12558.7165347419. The cubic root of 157721361 is about 540.2940339688.

The spelling of 157721361 in words is "one hundred fifty-seven million, seven hundred twenty-one thousand, three hundred sixty-one".