101997158 has 4 divisors (see below), whose sum is σ = 152995740. Its totient is φ = 50998578.

The previous prime is 101997151. The next prime is 101997163. The reversal of 101997158 is 851799101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 851799101 = 457 ⋅1863893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101997151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25499288 + ... + 25499291.

It is an arithmetic number, because the mean of its divisors is an integer number (38248935).

Almost surely, 2^101997158 is an apocalyptic number.

101997158 is a deficient number, since it is larger than the sum of its proper divisors (50998582).

101997158 is an equidigital number, since it uses as much as digits as its factorization.

101997158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50998581.

The product of its (nonzero) digits is 22680, while the sum is 41.

The square root of 101997158 is about 10099.3642374161. The cubic root of 101997158 is about 467.2285333317.

The spelling of 101997158 in words is "one hundred one million, nine hundred ninety-seven thousand, one hundred fifty-eight".