157275561 has 4 divisors (see below), whose sum is σ = 209700752. Its totient is φ = 104850372.

The previous prime is 157275557. The next prime is 157275563. The reversal of 157275561 is 165572751.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 157275561 - 2² = 157275557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (157275563) 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 in 3 ways as a sum of consecutive naturals, for example, 26212591 + ... + 26212596.

It is an arithmetic number, because the mean of its divisors is an integer number (52425188).

Almost surely, 2^157275561 is an apocalyptic number.

It is an amenable number.

157275561 is a deficient number, since it is larger than the sum of its proper divisors (52425191).

157275561 is an equidigital number, since it uses as much as digits as its factorization.

157275561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52425190.

The product of its digits is 73500, while the sum is 39.

The square root of 157275561 is about 12540.9553463841. The cubic root of 157275561 is about 539.7845059224.

The spelling of 157275561 in words is "one hundred fifty-seven million, two hundred seventy-five thousand, five hundred sixty-one".