100111261 has 2 divisors, whose sum is σ = 100111262. Its totient is φ = 100111260.

The previous prime is 100111237. The next prime is 100111273. The reversal of 100111261 is 162111001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100100025 + 11236 = 10005^2 + 106^2 .

It is a cyclic number.

It is not a de Polignac number, because 100111261 - 2⁵ = 100111229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100111061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50055630 + 50055631.

It is an arithmetic number, because the mean of its divisors is an integer number (50055631).

Almost surely, 2^100111261 is an apocalyptic number.

It is an amenable number.

100111261 is a deficient number, since it is larger than the sum of its proper divisors (1).

100111261 is an equidigital number, since it uses as much as digits as its factorization.

100111261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 100111261 is about 10005.5615034839. The cubic root of 100111261 is about 464.3309621633.

Adding to 100111261 its reverse (162111001), we get a palindrome (262222262).

The spelling of 100111261 in words is "one hundred million, one hundred eleven thousand, two hundred sixty-one".