199090954 has 4 divisors (see below), whose sum is σ = 298636434. Its totient is φ = 99545476.

The previous prime is 199090939. The next prime is 199090993. The reversal of 199090954 is 459090991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 459090991 = 631 ⋅727561.

It can be written as a sum of positive squares in only one way, i.e., 139877929 + 59213025 = 11827^2 + 7695^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49772737 + ... + 49772740.

Almost surely, 2^199090954 is an apocalyptic number.

199090954 is a deficient number, since it is larger than the sum of its proper divisors (99545480).

199090954 is an equidigital number, since it uses as much as digits as its factorization.

199090954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99545479.

The product of its (nonzero) digits is 131220, while the sum is 46.

The square root of 199090954 is about 14109.9593904448. The cubic root of 199090954 is about 583.9161796414.

The spelling of 199090954 in words is "one hundred ninety-nine million, ninety thousand, nine hundred fifty-four".