451223987 has 2 divisors, whose sum is σ = 451223988. Its totient is φ = 451223986.

The previous prime is 451223909. The next prime is 451224019. The reversal of 451223987 is 789322154.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-451223987 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (451223287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 225611993 + 225611994.

It is an arithmetic number, because the mean of its divisors is an integer number (225611994).

Almost surely, 2^451223987 is an apocalyptic number.

451223987 is a deficient number, since it is larger than the sum of its proper divisors (1).

451223987 is an equidigital number, since it uses as much as digits as its factorization.

451223987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 41.

The square root of 451223987 is about 21242.0334949364. The cubic root of 451223987 is about 767.0035832561.

The spelling of 451223987 in words is "four hundred fifty-one million, two hundred twenty-three thousand, nine hundred eighty-seven".