161390149 has 4 divisors (see below), whose sum is σ = 168407136. Its totient is φ = 154373164.

The previous prime is 161390113. The next prime is 161390167. The reversal of 161390149 is 941093161.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 941093161 = 19 ⋅49531219.

It is a cyclic number.

It is not a de Polignac number, because 161390149 - 2²⁵ = 127835717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161390179) 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, 3508459 + ... + 3508504.

It is an arithmetic number, because the mean of its divisors is an integer number (42101784).

Almost surely, 2^161390149 is an apocalyptic number.

It is an amenable number.

161390149 is a deficient number, since it is larger than the sum of its proper divisors (7016987).

161390149 is an equidigital number, since it uses as much as digits as its factorization.

161390149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7016986.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 161390149 is about 12703.9422621484. The cubic root of 161390149 is about 544.4512603787.

The spelling of 161390149 in words is "one hundred sixty-one million, three hundred ninety thousand, one hundred forty-nine".