101993951 has 4 divisors (see below), whose sum is σ = 102643752. Its totient is φ = 101344152.

The previous prime is 101993923. The next prime is 101993959. The reversal of 101993951 is 159399101.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 159399101 = 3271 ⋅48731.

It is a cyclic number.

It is not a de Polignac number, because 101993951 - 2⁶ = 101993887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101993959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 324665 + ... + 324978.

It is an arithmetic number, because the mean of its divisors is an integer number (25660938).

Almost surely, 2^101993951 is an apocalyptic number.

101993951 is a deficient number, since it is larger than the sum of its proper divisors (649801).

101993951 is an equidigital number, since it uses as much as digits as its factorization.

101993951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649800.

The product of its (nonzero) digits is 10935, while the sum is 38.

The square root of 101993951 is about 10099.2054637976. The cubic root of 101993951 is about 467.2236364057.

The spelling of 101993951 in words is "one hundred one million, nine hundred ninety-three thousand, nine hundred fifty-one".