1111229261 has 2 divisors, whose sum is σ = 1111229262. Its totient is φ = 1111229260.

The previous prime is 1111229257. The next prime is 1111229297. The reversal of 1111229261 is 1629221111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1082015236 + 29214025 = 32894^2 + 5405^2 .

It is a cyclic number.

It is not a de Polignac number, because 1111229261 - 2² = 1111229257 is a prime.

It is a super-2 number, since 2×1111229261² = 2469660941005212242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1111229261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1111220261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555614630 + 555614631.

It is an arithmetic number, because the mean of its divisors is an integer number (555614631).

Almost surely, 2^1111229261 is an apocalyptic number.

It is an amenable number.

1111229261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111229261 is an equidigital number, since it uses as much as digits as its factorization.

1111229261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 26.

The square root of 1111229261 is about 33335.1055345562. The cubic root of 1111229261 is about 1035.7808792676.

The spelling of 1111229261 in words is "one billion, one hundred eleven million, two hundred twenty-nine thousand, two hundred sixty-one".