161451790 has 16 divisors (see below), whose sum is σ = 291610368. Its totient is φ = 64359136.

The previous prime is 161451761. The next prime is 161451791. The reversal of 161451790 is 97154161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161451791) 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, 24622 + ... + 30481.

It is an arithmetic number, because the mean of its divisors is an integer number (18225648).

Almost surely, 2^161451790 is an apocalyptic number.

161451790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161451790 is a deficient number, since it is larger than the sum of its proper divisors (130158578).

161451790 is a wasteful number, since it uses less digits than its factorization.

161451790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55403.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 161451790 is about 12706.3680884822. The cubic root of 161451790 is about 544.5205670631.

The spelling of 161451790 in words is "one hundred sixty-one million, four hundred fifty-one thousand, seven hundred ninety".