1111001261 has 2 divisors, whose sum is σ = 1111001262. Its totient is φ = 1111001260.

The previous prime is 1111001233. The next prime is 1111001293. The reversal of 1111001261 is 1621001111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 854392900 + 256608361 = 29230^2 + 16019^2 .

It is a cyclic number.

It is not a de Polignac number, because 1111001261 - 2¹⁴ = 1110984877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1111009261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555500630 + 555500631.

It is an arithmetic number, because the mean of its divisors is an integer number (555500631).

Almost surely, 2^1111001261 is an apocalyptic number.

It is an amenable number.

1111001261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111001261 is an equidigital number, since it uses as much as digits as its factorization.

1111001261 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 14.

The square root of 1111001261 is about 33331.6855409384. The cubic root of 1111001261 is about 1035.7100345428.

Adding to 1111001261 its reverse (1621001111), we get a palindrome (2732002372).

The spelling of 1111001261 in words is "one billion, one hundred eleven million, one thousand, two hundred sixty-one".