157884521 has 2 divisors, whose sum is σ = 157884522. Its totient is φ = 157884520.

The previous prime is 157884427. The next prime is 157884533. The reversal of 157884521 is 125488751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128029225 + 29855296 = 11315^2 + 5464^2 .

It is an emirp because it is prime and its reverse (125488751) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157884521 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p_8862485 and since 157884521 and 8862485 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (157884541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78942260 + 78942261.

It is an arithmetic number, because the mean of its divisors is an integer number (78942261).

Almost surely, 2^157884521 is an apocalyptic number.

It is an amenable number.

157884521 is a deficient number, since it is larger than the sum of its proper divisors (1).

157884521 is an equidigital number, since it uses as much as digits as its factorization.

157884521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 89600, while the sum is 41.

The square root of 157884521 is about 12565.2107423632. The cubic root of 157884521 is about 540.4802780164.

The spelling of 157884521 in words is "one hundred fifty-seven million, eight hundred eighty-four thousand, five hundred twenty-one".