1290836321 has 2 divisors, whose sum is σ = 1290836322. Its totient is φ = 1290836320.

The previous prime is 1290836317. The next prime is 1290836329. The reversal of 1290836321 is 1236380921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1231237921 + 59598400 = 35089^2 + 7720^2 .

It is an emirp because it is prime and its reverse (1236380921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1290836321 - 2² = 1290836317 is a prime.

It is a super-2 number, since 2×1290836321² = 3332516815225630082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1290836329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645418160 + 645418161.

It is an arithmetic number, because the mean of its divisors is an integer number (645418161).

Almost surely, 2^1290836321 is an apocalyptic number.

It is an amenable number.

1290836321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1290836321 is an equidigital number, since it uses as much as digits as its factorization.

1290836321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 1290836321 is about 35928.2106568084. The cubic root of 1290836321 is about 1088.8224302726.

The spelling of 1290836321 in words is "one billion, two hundred ninety million, eight hundred thirty-six thousand, three hundred twenty-one".