1111400261 has 2 divisors, whose sum is σ = 1111400262. Its totient is φ = 1111400260.

The previous prime is 1111400233. The next prime is 1111400293. The reversal of 1111400261 is 1620041111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 804800161 + 306600100 = 28369^2 + 17510^2 .

It is a cyclic number.

It is not a de Polignac number, because 1111400261 - 2¹⁴ = 1111383877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1111430261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555700130 + 555700131.

It is an arithmetic number, because the mean of its divisors is an integer number (555700131).

Almost surely, 2^1111400261 is an apocalyptic number.

It is an amenable number.

1111400261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111400261 is an equidigital number, since it uses as much as digits as its factorization.

1111400261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 17.

The square root of 1111400261 is about 33337.6702995275. The cubic root of 1111400261 is about 1035.8340064521.

Adding to 1111400261 its reverse (1620041111), we get a palindrome (2731441372).

The spelling of 1111400261 in words is "one billion, one hundred eleven million, four hundred thousand, two hundred sixty-one".