161900254 has 16 divisors (see below), whose sum is σ = 256089600. Its totient is φ = 76552344.

The previous prime is 161900251. The next prime is 161900257. The reversal of 161900254 is 452009161.

It is an interprime number because it is at equal distance from previous prime (161900251) and next prime (161900257).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161900251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19557 + ... + 26575.

It is an arithmetic number, because the mean of its divisors is an integer number (16005600).

Almost surely, 2^161900254 is an apocalyptic number.

161900254 is a deficient number, since it is larger than the sum of its proper divisors (94189346).

161900254 is a wasteful number, since it uses less digits than its factorization.

161900254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7647.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 161900254 is about 12724.0030650735. The cubic root of 161900254 is about 545.0242718478.

The spelling of 161900254 in words is "one hundred sixty-one million, nine hundred thousand, two hundred fifty-four".