161140891 has 2 divisors, whose sum is σ = 161140892. Its totient is φ = 161140890.

The previous prime is 161140877. The next prime is 161140933. The reversal of 161140891 is 198041161.

161140891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161140891 - 2⁹ = 161140379 is a prime.

It is not a weakly prime, because it can be changed into another prime (161140801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80570445 + 80570446.

It is an arithmetic number, because the mean of its divisors is an integer number (80570446).

Almost surely, 2^161140891 is an apocalyptic number.

161140891 is a deficient number, since it is larger than the sum of its proper divisors (1).

161140891 is an equidigital number, since it uses as much as digits as its factorization.

161140891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 31.

The square root of 161140891 is about 12694.1282095306. The cubic root of 161140891 is about 544.1708245157.

The spelling of 161140891 in words is "one hundred sixty-one million, one hundred forty thousand, eight hundred ninety-one".