161292250 has 128 divisors (see below), whose sum is σ = 368769024. Its totient is φ = 51667200.

The previous prime is 161292247. The next prime is 161292251. The reversal of 161292250 is 52292161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161292251) 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 63 ways as a sum of consecutive naturals, for example, 3043224 + ... + 3043276.

It is an arithmetic number, because the mean of its divisors is an integer number (2881008).

Almost surely, 2^161292250 is an apocalyptic number.

161292250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161292250 is an abundant number, since it is smaller than the sum of its proper divisors (207476774).

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

161292250 is a wasteful number, since it uses less digits than its factorization.

161292250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161 (or 151 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 161292250 is about 12700.0885823682. The cubic root of 161292250 is about 544.3411503639.

The spelling of 161292250 in words is "one hundred sixty-one million, two hundred ninety-two thousand, two hundred fifty".