1011099961 has 2 divisors, whose sum is σ = 1011099962. Its totient is φ = 1011099960.

The previous prime is 1011099923. The next prime is 1011099989. The reversal of 1011099961 is 1699901101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1006856361 + 4243600 = 31731^2 + 2060^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011099961 - 2⁷ = 1011099833 is a prime.

It is a super-2 number, since 2×1011099961² = 2044646262268403042, 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 1011099961.

It is not a weakly prime, because it can be changed into another prime (1011099161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505549980 + 505549981.

It is an arithmetic number, because the mean of its divisors is an integer number (505549981).

Almost surely, 2^1011099961 is an apocalyptic number.

It is an amenable number.

1011099961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011099961 is an equidigital number, since it uses as much as digits as its factorization.

1011099961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4374, while the sum is 37.

The square root of 1011099961 is about 31797.7980526954. The cubic root of 1011099961 is about 1003.6863808973.

The spelling of 1011099961 in words is "one billion, eleven million, ninety-nine thousand, nine hundred sixty-one".