100987897 has 4 divisors (see below), whose sum is σ = 101043856. Its totient is φ = 100931940.

The previous prime is 100987891. The next prime is 100987903. The reversal of 100987897 is 798789001.

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: 798789001 = 359 ⋅2225039.

It is an interprime number because it is at equal distance from previous prime (100987891) and next prime (100987903).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100987897 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 100987897.

It is not an unprimeable number, because it can be changed into a prime (100987891) 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, 25179 + ... + 28912.

It is an arithmetic number, because the mean of its divisors is an integer number (25260964).

Almost surely, 2^100987897 is an apocalyptic number.

It is an amenable number.

100987897 is a deficient number, since it is larger than the sum of its proper divisors (55959).

100987897 is an equidigital number, since it uses as much as digits as its factorization.

100987897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55958.

The product of its (nonzero) digits is 254016, while the sum is 49.

The square root of 100987897 is about 10049.2734563251. The cubic root of 100987897 is about 465.6823481277.

The spelling of 100987897 in words is "one hundred million, nine hundred eighty-seven thousand, eight hundred ninety-seven".