161253811 has 8 divisors (see below), whose sum is σ = 163747584. Its totient is φ = 158773320.

The previous prime is 161253803. The next prime is 161253871. The reversal of 161253811 is 118352161.

161253811 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161253811 - 2³ = 161253803 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161253811.

It is not an unprimeable number, because it can be changed into a prime (161253871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22690 + ... + 28936.

It is an arithmetic number, because the mean of its divisors is an integer number (20468448).

Almost surely, 2^161253811 is an apocalyptic number.

161253811 is a deficient number, since it is larger than the sum of its proper divisors (2493773).

161253811 is an equidigital number, since it uses as much as digits as its factorization.

161253811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6641.

The product of its digits is 1440, while the sum is 28.

The square root of 161253811 is about 12698.5751562921. The cubic root of 161253811 is about 544.2979046575.

The spelling of 161253811 in words is "one hundred sixty-one million, two hundred fifty-three thousand, eight hundred eleven".