100820951 has 12 divisors (see below), whose sum is σ = 126652176. Its totient is φ = 78561120.

The previous prime is 100820947. The next prime is 100820963. The reversal of 100820951 is 159028001.

It is a happy number.

It is not a de Polignac number, because 100820951 - 2² = 100820947 is a prime.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 100820951.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100820981) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58670 + ... + 60363.

It is an arithmetic number, because the mean of its divisors is an integer number (10554348).

Almost surely, 2^100820951 is an apocalyptic number.

100820951 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

100820951 is a deficient number, since it is larger than the sum of its proper divisors (25831225).

100820951 is a wasteful number, since it uses less digits than its factorization.

100820951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119062 (or 119051 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 100820951 is about 10040.9636489731. The cubic root of 100820951 is about 465.4255956284.

Adding to 100820951 its reverse (159028001), we get a palindrome (259848952).

The spelling of 100820951 in words is "one hundred million, eight hundred twenty thousand, nine hundred fifty-one".