161893761 has 4 divisors (see below), whose sum is σ = 215858352. Its totient is φ = 107929172.

The previous prime is 161893751. The next prime is 161893783. The reversal of 161893761 is 167398161.

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 161893761 - 2⁵ = 161893729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161893751) 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, 26982291 + ... + 26982296.

It is an arithmetic number, because the mean of its divisors is an integer number (53964588).

Almost surely, 2^161893761 is an apocalyptic number.

It is an amenable number.

161893761 is a deficient number, since it is larger than the sum of its proper divisors (53964591).

161893761 is an equidigital number, since it uses as much as digits as its factorization.

161893761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53964590.

The product of its digits is 54432, while the sum is 42.

The square root of 161893761 is about 12723.7479148245. The cubic root of 161893761 is about 545.0169856951.

The spelling of 161893761 in words is "one hundred sixty-one million, eight hundred ninety-three thousand, seven hundred sixty-one".