101999998 has 4 divisors (see below), whose sum is σ = 153000000. Its totient is φ = 50999998.

The previous prime is 101999969. The next prime is 102000023. The reversal of 101999998 is 899999101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 899999101 = 727 ⋅1237963.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25499998 + ... + 25500001.

It is an arithmetic number, because the mean of its divisors is an integer number (38250000).

Almost surely, 2^101999998 is an apocalyptic number.

101999998 is a deficient number, since it is larger than the sum of its proper divisors (51000002).

101999998 is an equidigital number, since it uses as much as digits as its factorization.

101999998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51000001.

The product of its (nonzero) digits is 472392, while the sum is 55.

The square root of 101999998 is about 10099.5048393473. The cubic root of 101999998 is about 467.2328697817.

The spelling of 101999998 in words is "one hundred one million, nine hundred ninety-nine thousand, nine hundred ninety-eight".