158999090 has 8 divisors (see below), whose sum is σ = 286198380. Its totient is φ = 63599632.

The previous prime is 158999089. The next prime is 158999117. The reversal of 158999090 is 90999851.

It can be written as a sum of positive squares in 2 ways, for example, as 155475961 + 3523129 = 12469^2 + 1877^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7949945 + ... + 7949964.

Almost surely, 2^158999090 is an apocalyptic number.

158999090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

158999090 is a deficient number, since it is larger than the sum of its proper divisors (127199290).

158999090 is a wasteful number, since it uses less digits than its factorization.

158999090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15899916.

The product of its (nonzero) digits is 262440, while the sum is 50.

The square root of 158999090 is about 12609.4841290197. The cubic root of 158999090 is about 541.7491179682.

The spelling of 158999090 in words is "one hundred fifty-eight million, nine hundred ninety-nine thousand, ninety".