100778051 has 4 divisors (see below), whose sum is σ = 109939704. Its totient is φ = 91616400.

The previous prime is 100778017. The next prime is 100778059. The reversal of 100778051 is 150877001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 100778051 - 2²⁶ = 33669187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100778059) 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, 4580810 + ... + 4580831.

It is an arithmetic number, because the mean of its divisors is an integer number (27484926).

Almost surely, 2^100778051 is an apocalyptic number.

100778051 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

100778051 is the 4490-th centered decagonal number.

100778051 is a deficient number, since it is larger than the sum of its proper divisors (9161653).

100778051 is an equidigital number, since it uses as much as digits as its factorization.

100778051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9161652.

The product of its (nonzero) digits is 1960, while the sum is 29.

The square root of 100778051 is about 10038.8271725337. The cubic root of 100778051 is about 465.3595723448.

The spelling of 100778051 in words is "one hundred million, seven hundred seventy-eight thousand, fifty-one".