100640897 has 4 divisors (see below), whose sum is σ = 115018176. Its totient is φ = 86263620.

The previous prime is 100640873. The next prime is 100640923. The reversal of 100640897 is 798046001.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100640897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (100640807) 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, 7188629 + ... + 7188642.

It is an arithmetic number, because the mean of its divisors is an integer number (28754544).

Almost surely, 2^100640897 is an apocalyptic number.

It is an amenable number.

100640897 is a deficient number, since it is larger than the sum of its proper divisors (14377279).

100640897 is an equidigital number, since it uses as much as digits as its factorization.

100640897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14377278.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 100640897 is about 10031.9936702532. The cubic root of 100640897 is about 465.1483659604.

Adding to 100640897 its reverse (798046001), we get a palindrome (898686898).

The spelling of 100640897 in words is "one hundred million, six hundred forty thousand, eight hundred ninety-seven".