161560457 has 4 divisors (see below), whose sum is σ = 162080256. Its totient is φ = 161040660.

The previous prime is 161560447. The next prime is 161560481. The reversal of 161560457 is 754065161.

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, and also an emirpimes, since its reverse is a distinct semiprime: 754065161 = 109 ⋅6918029.

It is a cyclic number.

It is not a de Polignac number, because 161560457 - 2⁶ = 161560393 is a prime.

It is a super-2 number, since 2×161560457² = 52203562532097698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161560447) 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 in 3 ways as a sum of consecutive naturals, for example, 259433 + ... + 260054.

It is an arithmetic number, because the mean of its divisors is an integer number (40520064).

Almost surely, 2^161560457 is an apocalyptic number.

It is an amenable number.

161560457 is a deficient number, since it is larger than the sum of its proper divisors (519799).

161560457 is an equidigital number, since it uses as much as digits as its factorization.

161560457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519798.

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 161560457 is about 12710.6434534212. The cubic root of 161560457 is about 544.6427049597.

The spelling of 161560457 in words is "one hundred sixty-one million, five hundred sixty thousand, four hundred fifty-seven".