161894051 has 4 divisors (see below), whose sum is σ = 176611704. Its totient is φ = 147176400.

The previous prime is 161894027. The next prime is 161894081. The reversal of 161894051 is 150498161.

161894051 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161894051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161894021) 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, 7358810 + ... + 7358831.

It is an arithmetic number, because the mean of its divisors is an integer number (44152926).

Almost surely, 2^161894051 is an apocalyptic number.

161894051 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

161894051 is a deficient number, since it is larger than the sum of its proper divisors (14717653).

161894051 is a wasteful number, since it uses less digits than its factorization.

161894051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14717652.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 161894051 is about 12723.7593108326. The cubic root of 161894051 is about 545.0173111242.

The spelling of 161894051 in words is "one hundred sixty-one million, eight hundred ninety-four thousand, fifty-one".