1117788961 has 2 divisors, whose sum is σ = 1117788962. Its totient is φ = 1117788960.

The previous prime is 1117788929. The next prime is 1117788967. The reversal of 1117788961 is 1698877111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1051056400 + 66732561 = 32420^2 + 8169^2 .

It is a cyclic number.

It is not a de Polignac number, because 1117788961 - 2⁵ = 1117788929 is a prime.

It is a super-2 number, since 2×1117788961² = 2498904322666919042, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1117788967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 558894480 + 558894481.

It is an arithmetic number, because the mean of its divisors is an integer number (558894481).

Almost surely, 2^1117788961 is an apocalyptic number.

It is an amenable number.

1117788961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1117788961 is an equidigital number, since it uses as much as digits as its factorization.

1117788961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 169344, while the sum is 49.

The square root of 1117788961 is about 33433.3510285762. The cubic root of 1117788961 is about 1037.8149888120.

The spelling of 1117788961 in words is "one billion, one hundred seventeen million, seven hundred eighty-eight thousand, nine hundred sixty-one".