161849691 has 16 divisors (see below), whose sum is σ = 240064000. Its totient is φ = 107770824.

The previous prime is 161849663. The next prime is 161849711. The reversal of 161849691 is 196948161.

161849691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161849691 - 2⁵ = 161849659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161849491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23010 + ... + 29208.

It is an arithmetic number, because the mean of its divisors is an integer number (15004000).

Almost surely, 2^161849691 is an apocalyptic number.

161849691 is a deficient number, since it is larger than the sum of its proper divisors (78214309).

161849691 is an equidigital number, since it uses as much as digits as its factorization.

161849691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7175 (or 7169 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 161849691 is about 12722.0159959025. The cubic root of 161849691 is about 544.9675271733.

The spelling of 161849691 in words is "one hundred sixty-one million, eight hundred forty-nine thousand, six hundred ninety-one".