1254664819 has 2 divisors, whose sum is σ = 1254664820. Its totient is φ = 1254664818.

The previous prime is 1254664799. The next prime is 1254664841. The reversal of 1254664819 is 9184664521.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1254664819 - 2¹⁵ = 1254632051 is a prime.

It is a super-2 number, since 2×1254664819² = 3148367616072605522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1254661819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627332409 + 627332410.

It is an arithmetic number, because the mean of its divisors is an integer number (627332410).

Almost surely, 2^1254664819 is an apocalyptic number.

1254664819 is a deficient number, since it is larger than the sum of its proper divisors (1).

1254664819 is an equidigital number, since it uses as much as digits as its factorization.

1254664819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 414720, while the sum is 46.

The square root of 1254664819 is about 35421.2481287715. The cubic root of 1254664819 is about 1078.5556879435. Note that the first 3 decimals are identical.

The spelling of 1254664819 in words is "one billion, two hundred fifty-four million, six hundred sixty-four thousand, eight hundred nineteen".