1245673391 has 2 divisors, whose sum is σ = 1245673392. Its totient is φ = 1245673390.

The previous prime is 1245673369. The next prime is 1245673393. The reversal of 1245673391 is 1933765421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1245673391 - 2³⁰ = 171931567 is a prime.

Together with 1245673393, 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 (1245673393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622836695 + 622836696.

It is an arithmetic number, because the mean of its divisors is an integer number (622836696).

Almost surely, 2^1245673391 is an apocalyptic number.

1245673391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1245673391 is an equidigital number, since it uses as much as digits as its factorization.

1245673391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 41.

The square root of 1245673391 is about 35294.0985293576. The cubic root of 1245673391 is about 1075.9730554259.

The spelling of 1245673391 in words is "one billion, two hundred forty-five million, six hundred seventy-three thousand, three hundred ninety-one".