1131546989 has 2 divisors, whose sum is σ = 1131546990. Its totient is φ = 1131546988.

The previous prime is 1131546973. The next prime is 1131546991. The reversal of 1131546989 is 9896451311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1062108100 + 69438889 = 32590^2 + 8333^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131546989 - 2⁴ = 1131546973 is a prime.

It is a super-2 number, since 2×1131546989² = 2560797176629932242, which contains 22 as substring.

Together with 1131546991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131546289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565773494 + 565773495.

It is an arithmetic number, because the mean of its divisors is an integer number (565773495).

Almost surely, 2^1131546989 is an apocalyptic number.

It is an amenable number.

1131546989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131546989 is an equidigital number, since it uses as much as digits as its factorization.

1131546989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 47.

The square root of 1131546989 is about 33638.4748316567. The cubic root of 1131546989 is about 1042.0555342779.

The spelling of 1131546989 in words is "one billion, one hundred thirty-one million, five hundred forty-six thousand, nine hundred eighty-nine".