157436561 has 4 divisors (see below), whose sum is σ = 157462500. Its totient is φ = 157410624.

The previous prime is 157436557. The next prime is 157436581. The reversal of 157436561 is 165634751.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 90916225 + 66520336 = 9535^2 + 8156^2 .

It is a cyclic number.

It is not a de Polignac number, because 157436561 - 2² = 157436557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157436581) by changing a digit.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1565 + ... + 17813.

It is an arithmetic number, because the mean of its divisors is an integer number (39365625).

Almost surely, 2^157436561 is an apocalyptic number.

It is an amenable number.

157436561 is a deficient number, since it is larger than the sum of its proper divisors (25939).

157436561 is an equidigital number, since it uses as much as digits as its factorization.

157436561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25938.

The product of its digits is 75600, while the sum is 38.

The square root of 157436561 is about 12547.3726731934. The cubic root of 157436561 is about 539.9686321514.

The spelling of 157436561 in words is "one hundred fifty-seven million, four hundred thirty-six thousand, five hundred sixty-one".