161019390 has 48 divisors (see below), whose sum is σ = 449543952. Its totient is φ = 36804096.

The previous prime is 161019377. The next prime is 161019421. The reversal of 161019390 is 93910161.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53299 + ... + 56238.

It is an arithmetic number, because the mean of its divisors is an integer number (9365499).

Almost surely, 2^161019390 is an apocalyptic number.

161019390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161019390 is an abundant number, since it is smaller than the sum of its proper divisors (288524562).

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

161019390 is a wasteful number, since it uses less digits than its factorization.

161019390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109561 (or 109554 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 30.

The square root of 161019390 is about 12689.3415904845. The cubic root of 161019390 is about 544.0340209944.

The spelling of 161019390 in words is "one hundred sixty-one million, nineteen thousand, three hundred ninety".