1011310981 has 2 divisors, whose sum is σ = 1011310982. Its totient is φ = 1011310980.

The previous prime is 1011310933. The next prime is 1011311057. The reversal of 1011310981 is 1890131101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1007046756 + 4264225 = 31734^2 + 2065^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1011310981 is a prime.

It is a super-2 number, since 2×1011310981² = 2045499800582364722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1011310921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505655490 + 505655491.

It is an arithmetic number, because the mean of its divisors is an integer number (505655491).

Almost surely, 2^1011310981 is an apocalyptic number.

It is an amenable number.

1011310981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011310981 is an equidigital number, since it uses as much as digits as its factorization.

1011310981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 25.

The square root of 1011310981 is about 31801.1160338753. The cubic root of 1011310981 is about 1003.7562002939.

The spelling of 1011310981 in words is "one billion, eleven million, three hundred ten thousand, nine hundred eighty-one".