157144321 has 2 divisors, whose sum is σ = 157144322. Its totient is φ = 157144320.

The previous prime is 157144313. The next prime is 157144327. The reversal of 157144321 is 123441751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115863696 + 41280625 = 10764^2 + 6425^2 .

It is a cyclic number.

It is not a de Polignac number, because 157144321 - 2³ = 157144313 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 157144321.

It is not a weakly prime, because it can be changed into another prime (157144327) 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, 78572160 + 78572161.

It is an arithmetic number, because the mean of its divisors is an integer number (78572161).

Almost surely, 2^157144321 is an apocalyptic number.

It is an amenable number.

157144321 is a deficient number, since it is larger than the sum of its proper divisors (1).

157144321 is an equidigital number, since it uses as much as digits as its factorization.

157144321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3360, while the sum is 28.

The square root of 157144321 is about 12535.7217981255. The cubic root of 157144321 is about 539.6343214692.

The spelling of 157144321 in words is "one hundred fifty-seven million, one hundred forty-four thousand, three hundred twenty-one".