1143592981 has 2 divisors, whose sum is σ = 1143592982. Its totient is φ = 1143592980.

The previous prime is 1143592969. The next prime is 1143592991. The reversal of 1143592981 is 1892953411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 995970481 + 147622500 = 31559^2 + 12150^2 .

It is a cyclic number.

It is not a de Polignac number, because 1143592981 - 2⁵ = 1143592949 is a prime.

It is a super-2 number, since 2×1143592981² = 2615609812384932722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1143592991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 571796490 + 571796491.

It is an arithmetic number, because the mean of its divisors is an integer number (571796491).

Almost surely, 2^1143592981 is an apocalyptic number.

It is an amenable number.

1143592981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1143592981 is an equidigital number, since it uses as much as digits as its factorization.

1143592981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 43.

The square root of 1143592981 is about 33817.0516307971. The cubic root of 1143592981 is about 1045.7402570684.

The spelling of 1143592981 in words is "one billion, one hundred forty-three million, five hundred ninety-two thousand, nine hundred eighty-one".