1213003391 has 2 divisors, whose sum is σ = 1213003392. Its totient is φ = 1213003390.

The previous prime is 1213003381. The next prime is 1213003399. The reversal of 1213003391 is 1933003121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1213003391 - 2¹⁴ = 1212987007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213003399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606501695 + 606501696.

It is an arithmetic number, because the mean of its divisors is an integer number (606501696).

Almost surely, 2^1213003391 is an apocalyptic number.

1213003391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213003391 is an equidigital number, since it uses as much as digits as its factorization.

1213003391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486, while the sum is 23.

The square root of 1213003391 is about 34828.1982163878. The cubic root of 1213003391 is about 1066.4831667522.

The spelling of 1213003391 in words is "one billion, two hundred thirteen million, three thousand, three hundred ninety-one".