654613991 has 2 divisors, whose sum is σ = 654613992. Its totient is φ = 654613990.

The previous prime is 654613963. The next prime is 654614003. The reversal of 654613991 is 199316456.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 654613991 - 2¹⁴ = 654597607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (654613931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327306995 + 327306996.

It is an arithmetic number, because the mean of its divisors is an integer number (327306996).

Almost surely, 2^654613991 is an apocalyptic number.

654613991 is a deficient number, since it is larger than the sum of its proper divisors (1).

654613991 is an equidigital number, since it uses as much as digits as its factorization.

654613991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174960, while the sum is 44.

The square root of 654613991 is about 25585.4253628897. The cubic root of 654613991 is about 868.2839255890.

The spelling of 654613991 in words is "six hundred fifty-four million, six hundred thirteen thousand, nine hundred ninety-one".