161967903 has 4 divisors (see below), whose sum is σ = 215957208. Its totient is φ = 107978600.

The previous prime is 161967893. The next prime is 161967919. The reversal of 161967903 is 309769161.

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

It is a cyclic number.

It is not a de Polignac number, because 161967903 - 2⁴ = 161967887 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161967983) 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, 26994648 + ... + 26994653.

It is an arithmetic number, because the mean of its divisors is an integer number (53989302).

Almost surely, 2^161967903 is an apocalyptic number.

161967903 is a deficient number, since it is larger than the sum of its proper divisors (53989305).

161967903 is an equidigital number, since it uses as much as digits as its factorization.

161967903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53989304.

The product of its (nonzero) digits is 61236, while the sum is 42.

The square root of 161967903 is about 12726.6611096548. The cubic root of 161967903 is about 545.1001729287.

The spelling of 161967903 in words is "one hundred sixty-one million, nine hundred sixty-seven thousand, nine hundred three".