100561851 has 64 divisors (see below), whose sum is σ = 179020800. Its totient is φ = 55116288.

The previous prime is 100561849. The next prime is 100561859. The reversal of 100561851 is 158165001.

It is not a de Polignac number, because 100561851 - 2¹ = 100561849 is a prime.

It is a super-2 number, since 2×100561851² = 20225371753092402, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (100561859) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 112930 + ... + 113816.

It is an arithmetic number, because the mean of its divisors is an integer number (2797200).

Almost surely, 2^100561851 is an apocalyptic number.

100561851 is a deficient number, since it is larger than the sum of its proper divisors (78458949).

100561851 is a wasteful number, since it uses less digits than its factorization.

100561851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 945 (or 939 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 27.

The square root of 100561851 is about 10028.0532008960. The cubic root of 100561851 is about 465.0265541548.

The spelling of 100561851 in words is "one hundred million, five hundred sixty-one thousand, eight hundred fifty-one".