157154581 has 2 divisors, whose sum is σ = 157154582. Its totient is φ = 157154580.

The previous prime is 157154573. The next prime is 157154587. The reversal of 157154581 is 185451751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156500100 + 654481 = 12510^2 + 809^2 .

It is an emirp because it is prime and its reverse (185451751) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 157154581 - 2³ = 157154573 is a prime.

It is a super-2 number, since 2×157154581² = 49395124658571122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 157154581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157154587) 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 as a sum of consecutive naturals, namely, 78577290 + 78577291.

It is an arithmetic number, because the mean of its divisors is an integer number (78577291).

Almost surely, 2^157154581 is an apocalyptic number.

It is an amenable number.

157154581 is a deficient number, since it is larger than the sum of its proper divisors (1).

157154581 is an equidigital number, since it uses as much as digits as its factorization.

157154581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28000, while the sum is 37.

The square root of 157154581 is about 12536.1310219701. The cubic root of 157154581 is about 539.6460655093.

The spelling of 157154581 in words is "one hundred fifty-seven million, one hundred fifty-four thousand, five hundred eighty-one".