161157258 has 12 divisors (see below), whose sum is σ = 349174098. Its totient is φ = 53719080.

The previous prime is 161157257. The next prime is 161157349. The reversal of 161157258 is 852751161.

It can be written as a sum of positive squares in only one way, i.e., 101666889 + 59490369 = 10083^2 + 7713^2 .

It is not an unprimeable number, because it can be changed into a prime (161157257) 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 5 ways as a sum of consecutive naturals, for example, 4476573 + ... + 4476608.

Almost surely, 2^161157258 is an apocalyptic number.

161157258 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

161157258 is an abundant number, since it is smaller than the sum of its proper divisors (188016840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161157258 is a wasteful number, since it uses less digits than its factorization.

161157258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8953189 (or 8953186 counting only the distinct ones).

The product of its digits is 16800, while the sum is 36.

The square root of 161157258 is about 12694.7728613000. The cubic root of 161157258 is about 544.1892476118.

The spelling of 161157258 in words is "one hundred sixty-one million, one hundred fifty-seven thousand, two hundred fifty-eight".