163949090 has 32 divisors (see below), whose sum is σ = 301145904. Its totient is φ = 64247040.

The previous prime is 163949089. The next prime is 163949147. The reversal of 163949090 is 90949361.

It can be written as a sum of positive squares in 8 ways, for example, as 93103201 + 70845889 = 9649^2 + 8417^2 .

It is a super-2 number, since 2×163949090² = 53758608223656200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 241832 + ... + 242508.

Almost surely, 2^163949090 is an apocalyptic number.

163949090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

163949090 is a deficient number, since it is larger than the sum of its proper divisors (137196814).

163949090 is a wasteful number, since it uses less digits than its factorization.

163949090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1142.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 163949090 is about 12804.2606190283. The cubic root of 163949090 is about 547.3137221355.

The spelling of 163949090 in words is "one hundred sixty-three million, nine hundred forty-nine thousand, ninety".