161250881 has 4 divisors (see below), whose sum is σ = 175910064. Its totient is φ = 146591700.

The previous prime is 161250863. The next prime is 161250883. The reversal of 161250881 is 188052161.

161250881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 161250881 - 2¹⁰ = 161249857 is a prime.

It is a super-2 number, since 2×161250881² = 52003693246552322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161250883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7329575 + ... + 7329596.

It is an arithmetic number, because the mean of its divisors is an integer number (43977516).

Almost surely, 2^161250881 is an apocalyptic number.

161250881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

161250881 is a deficient number, since it is larger than the sum of its proper divisors (14659183).

161250881 is a wasteful number, since it uses less digits than its factorization.

161250881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14659182.

The product of its (nonzero) digits is 3840, while the sum is 32.

The square root of 161250881 is about 12698.4597884940. The cubic root of 161250881 is about 544.2946079860.

The spelling of 161250881 in words is "one hundred sixty-one million, two hundred fifty thousand, eight hundred eighty-one".