161391050 has 12 divisors (see below), whose sum is σ = 300187446. Its totient is φ = 64556400.

The previous prime is 161391017. The next prime is 161391059. The reversal of 161391050 is 50193161.

161391050 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 151462249 + 9928801 = 12307^2 + 3151^2 .

It is not an unprimeable number, because it can be changed into a prime (161391059) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1613861 + ... + 1613960.

Almost surely, 2^161391050 is an apocalyptic number.

161391050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161391050 is a deficient number, since it is larger than the sum of its proper divisors (138796396).

161391050 is a wasteful number, since it uses less digits than its factorization.

161391050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3227833 (or 3227828 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 26.

The square root of 161391050 is about 12703.9777235321. The cubic root of 161391050 is about 544.4522735543.

The spelling of 161391050 in words is "one hundred sixty-one million, three hundred ninety-one thousand, fifty".