161530957 has 16 divisors (see below), whose sum is σ = 202210560. Its totient is φ = 125814528.

The previous prime is 161530933. The next prime is 161530961. The reversal of 161530957 is 759035161.

It is not a de Polignac number, because 161530957 - 2⁷ = 161530829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161530907) 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 15 ways as a sum of consecutive naturals, for example, 19953 + ... + 26854.

It is an arithmetic number, because the mean of its divisors is an integer number (12638160).

Almost surely, 2^161530957 is an apocalyptic number.

161530957 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

161530957 is a deficient number, since it is larger than the sum of its proper divisors (40679603).

161530957 is a wasteful number, since it uses less digits than its factorization.

161530957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46860.

The product of its (nonzero) digits is 28350, while the sum is 37.

The square root of 161530957 is about 12709.4829556517. The cubic root of 161530957 is about 544.6095534115.

The spelling of 161530957 in words is "one hundred sixty-one million, five hundred thirty thousand, nine hundred fifty-seven".