1312009889 has 2 divisors, whose sum is σ = 1312009890. Its totient is φ = 1312009888.

The previous prime is 1312009883. The next prime is 1312009943. The reversal of 1312009889 is 9889002131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1297440400 + 14569489 = 36020^2 + 3817^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1312009889 is a prime.

It is not a weakly prime, because it can be changed into another prime (1312009883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656004944 + 656004945.

It is an arithmetic number, because the mean of its divisors is an integer number (656004945).

Almost surely, 2^1312009889 is an apocalyptic number.

It is an amenable number.

1312009889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312009889 is an equidigital number, since it uses as much as digits as its factorization.

1312009889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 1312009889 is about 36221.6770594626. The cubic root of 1312009889 is about 1094.7434854332.

The spelling of 1312009889 in words is "one billion, three hundred twelve million, nine thousand, eight hundred eighty-nine".