654401999 has 2 divisors, whose sum is σ = 654402000. Its totient is φ = 654401998.

The previous prime is 654401989. The next prime is 654402011. The reversal of 654401999 is 999104456.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 654401999 - 2¹² = 654397903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (654401939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327200999 + 327201000.

It is an arithmetic number, because the mean of its divisors is an integer number (327201000).

Almost surely, 2^654401999 is an apocalyptic number.

654401999 is a deficient number, since it is larger than the sum of its proper divisors (1).

654401999 is an equidigital number, since it uses as much as digits as its factorization.

654401999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 349920, while the sum is 47.

The square root of 654401999 is about 25581.2822000775. The cubic root of 654401999 is about 868.1901863157.

The spelling of 654401999 in words is "six hundred fifty-four million, four hundred one thousand, nine hundred ninety-nine".