157721357 has 2 divisors, whose sum is σ = 157721358. Its totient is φ = 157721356.

The previous prime is 157721353. The next prime is 157721407. The reversal of 157721357 is 753127751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150651076 + 7070281 = 12274^2 + 2659^2 .

It is a cyclic number.

It is not a de Polignac number, because 157721357 - 2² = 157721353 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 157721357.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157721353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78860678 + 78860679.

It is an arithmetic number, because the mean of its divisors is an integer number (78860679).

Almost surely, 2^157721357 is an apocalyptic number.

It is an amenable number.

157721357 is a deficient number, since it is larger than the sum of its proper divisors (1).

157721357 is an equidigital number, since it uses as much as digits as its factorization.

157721357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51450, while the sum is 38.

The square root of 157721357 is about 12558.7163754900. The cubic root of 157721357 is about 540.2940294013.

The spelling of 157721357 in words is "one hundred fifty-seven million, seven hundred twenty-one thousand, three hundred fifty-seven".