100747512891 has 24 divisors (see below), whose sum is σ = 146319430400. Its totient is φ = 66798270000.

The previous prime is 100747512821. The next prime is 100747512907. The reversal of 100747512891 is 198215747001.

It is a happy number.

100747512891 is a `hidden beast` number, since 1 + 0 + 0 + 7 + 47 + 512 + 8 + 91 = 666.

It is not a de Polignac number, because 100747512891 - 2¹³ = 100747504699 is a prime.

It is a super-2 number, since 2×100747512891² (a number of 23 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100747512821) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4557816 + ... + 4579866.

Almost surely, 2^100747512891 is an apocalyptic number.

100747512891 is a deficient number, since it is larger than the sum of its proper divisors (45571917509).

100747512891 is a wasteful number, since it uses less digits than its factorization.

100747512891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24807 (or 24804 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 45.

The spelling of 100747512891 in words is "one hundred billion, seven hundred forty-seven million, five hundred twelve thousand, eight hundred ninety-one".