161090501 has 16 divisors (see below), whose sum is σ = 189641088. Its totient is φ = 134904000.

The previous prime is 161090497. The next prime is 161090509. The reversal of 161090501 is 105090161.

It is not a de Polignac number, because 161090501 - 2² = 161090497 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161090509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99440 + ... + 101046.

It is an arithmetic number, because the mean of its divisors is an integer number (11852568).

Almost surely, 2^161090501 is an apocalyptic number.

161090501 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

161090501 is a deficient number, since it is larger than the sum of its proper divisors (28550587).

161090501 is a wasteful number, since it uses less digits than its factorization.

161090501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2332.

The product of its (nonzero) digits is 270, while the sum is 23.

The square root of 161090501 is about 12692.1432784223. The cubic root of 161090501 is about 544.1140964636.

The spelling of 161090501 in words is "one hundred sixty-one million, ninety thousand, five hundred one".