100402261 has 2 divisors, whose sum is σ = 100402262. Its totient is φ = 100402260.

The previous prime is 100402249. The next prime is 100402271. The reversal of 100402261 is 162204001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74494161 + 25908100 = 8631^2 + 5090^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100402261 is a prime.

It is a super-2 number, since 2×100402261² = 20161228027824242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100402271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50201130 + 50201131.

It is an arithmetic number, because the mean of its divisors is an integer number (50201131).

Almost surely, 2^100402261 is an apocalyptic number.

It is an amenable number.

100402261 is a deficient number, since it is larger than the sum of its proper divisors (1).

100402261 is an equidigital number, since it uses as much as digits as its factorization.

100402261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 100402261 is about 10020.0928638411. The cubic root of 100402261 is about 464.7804274169.

Adding to 100402261 its reverse (162204001), we get a palindrome (262606262).

The spelling of 100402261 in words is "one hundred million, four hundred two thousand, two hundred sixty-one".