1012400989 has 2 divisors, whose sum is σ = 1012400990. Its totient is φ = 1012400988.

The previous prime is 1012400981. The next prime is 1012401023. The reversal of 1012400989 is 9890042101.

It is an a-pointer prime, because the next prime (1012401023) can be obtained adding 1012400989 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 834632100 + 177768889 = 28890^2 + 13333^2 .

It is an emirp because it is prime and its reverse (9890042101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1012400989 - 2³ = 1012400981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1012400981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506200494 + 506200495.

It is an arithmetic number, because the mean of its divisors is an integer number (506200495).

Almost surely, 2^1012400989 is an apocalyptic number.

It is an amenable number.

1012400989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1012400989 is an equidigital number, since it uses as much as digits as its factorization.

1012400989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 1012400989 is about 31818.2493075908. The cubic root of 1012400989 is about 1004.1166925867.

The spelling of 1012400989 in words is "one billion, twelve million, four hundred thousand, nine hundred eighty-nine".