1145509931 has 2 divisors, whose sum is σ = 1145509932. Its totient is φ = 1145509930.

The previous prime is 1145509919. The next prime is 1145509933. The reversal of 1145509931 is 1399055411.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1145509931 is a prime.

It is a super-2 number, since 2×1145509931² = 2624386004039249522, which contains 22 as substring.

Together with 1145509933, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1145509933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 572754965 + 572754966.

It is an arithmetic number, because the mean of its divisors is an integer number (572754966).

Almost surely, 2^1145509931 is an apocalyptic number.

1145509931 is a deficient number, since it is larger than the sum of its proper divisors (1).

1145509931 is an equidigital number, since it uses as much as digits as its factorization.

1145509931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24300, while the sum is 38.

The square root of 1145509931 is about 33845.3827131560. The cubic root of 1145509931 is about 1046.3242389488.

The spelling of 1145509931 in words is "one billion, one hundred forty-five million, five hundred nine thousand, nine hundred thirty-one".