161045490 has 32 divisors (see below), whose sum is σ = 392849856. Its totient is φ = 42240960.

The previous prime is 161045477. The next prime is 161045491. The reversal of 161045490 is 94540161.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (161045491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42172 + ... + 45831.

It is an arithmetic number, because the mean of its divisors is an integer number (12276558).

Almost surely, 2^161045490 is an apocalyptic number.

161045490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161045490 is an abundant number, since it is smaller than the sum of its proper divisors (231804366).

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

161045490 is a wasteful number, since it uses less digits than its factorization.

161045490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88074.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 161045490 is about 12690.3699709662. The cubic root of 161045490 is about 544.0634139779.

The spelling of 161045490 in words is "one hundred sixty-one million, forty-five thousand, four hundred ninety".