101973981 has 4 divisors (see below), whose sum is σ = 135965312. Its totient is φ = 67982652.

The previous prime is 101973967. The next prime is 101973997. The reversal of 101973981 is 189379101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 189379101 = 3 ⋅63126367.

It is not a de Polignac number, because 101973981 - 2⁶ = 101973917 is a prime.

It is a super-2 number, since 2×101973981² = 20797385601976722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101973901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16995661 + ... + 16995666.

It is an arithmetic number, because the mean of its divisors is an integer number (33991328).

Almost surely, 2^101973981 is an apocalyptic number.

It is an amenable number.

101973981 is a deficient number, since it is larger than the sum of its proper divisors (33991331).

101973981 is an equidigital number, since it uses as much as digits as its factorization.

101973981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33991330.

The product of its (nonzero) digits is 13608, while the sum is 39.

The square root of 101973981 is about 10098.2167237587. The cubic root of 101973981 is about 467.1931409206.

The spelling of 101973981 in words is "one hundred one million, nine hundred seventy-three thousand, nine hundred eighty-one".