161325257 has 8 divisors (see below), whose sum is σ = 179805600. Its totient is φ = 143843904.

The previous prime is 161325253. The next prime is 161325299. The reversal of 161325257 is 752523161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161325257 - 2² = 161325253 is a prime.

It is a super-2 number, since 2×161325257² = 52051677092232098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161325253) 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 7 ways as a sum of consecutive naturals, for example, 249407 + ... + 250052.

It is an arithmetic number, because the mean of its divisors is an integer number (22475700).

Almost surely, 2^161325257 is an apocalyptic number.

161325257 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

161325257 is a deficient number, since it is larger than the sum of its proper divisors (18480343).

161325257 is a wasteful number, since it uses less digits than its factorization.

161325257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499495.

The product of its digits is 12600, while the sum is 32.

The square root of 161325257 is about 12701.3879950185. The cubic root of 161325257 is about 544.3782793289.

The spelling of 161325257 in words is "one hundred sixty-one million, three hundred twenty-five thousand, two hundred fifty-seven".