8457223391 has 2 divisors, whose sum is σ = 8457223392. Its totient is φ = 8457223390.

The previous prime is 8457223387. The next prime is 8457223417. The reversal of 8457223391 is 1933227548.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8457223391 - 2² = 8457223387 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8457223591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4228611695 + 4228611696.

It is an arithmetic number, because the mean of its divisors is an integer number (4228611696).

Almost surely, 2^8457223391 is an apocalyptic number.

8457223391 is a deficient number, since it is larger than the sum of its proper divisors (1).

8457223391 is an equidigital number, since it uses as much as digits as its factorization.

8457223391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 44.

The square root of 8457223391 is about 91963.1632285449. The cubic root of 8457223391 is about 2037.3982749017.

The spelling of 8457223391 in words is "eight billion, four hundred fifty-seven million, two hundred twenty-three thousand, three hundred ninety-one".