161401590 has 72 divisors (see below), whose sum is σ = 488170800. Its totient is φ = 36890784.

The previous prime is 161401577. The next prime is 161401601. The reversal of 161401590 is 95104161.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 13890 + ... + 22709.

It is an arithmetic number, because the mean of its divisors is an integer number (6780150).

Almost surely, 2^161401590 is an apocalyptic number.

161401590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161401590 is an abundant number, since it is smaller than the sum of its proper divisors (326769210).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161401590 is a wasteful number, since it uses less digits than its factorization.

161401590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36626 (or 36616 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 161401590 is about 12704.3925474617. The cubic root of 161401590 is about 544.4641255168.

The spelling of 161401590 in words is "one hundred sixty-one million, four hundred one thousand, five hundred ninety".