161097420 has 48 divisors (see below), whose sum is σ = 492081408. Its totient is φ = 39053760.

The previous prime is 161097403. The next prime is 161097463. The reversal of 161097420 is 24790161.

It is a happy number.

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

It is an unprimeable number.

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, 121384 + ... + 122703.

It is an arithmetic number, because the mean of its divisors is an integer number (10251696).

Almost surely, 2^161097420 is an apocalyptic number.

161097420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161097420 is an abundant number, since it is smaller than the sum of its proper divisors (330983988).

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

161097420 is a wasteful number, since it uses less digits than its factorization.

161097420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244110 (or 244108 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 161097420 is about 12692.4158456930. The cubic root of 161097420 is about 544.1218864357.

The spelling of 161097420 in words is "one hundred sixty-one million, ninety-seven thousand, four hundred twenty".