320064551 has 2 divisors, whose sum is σ = 320064552. Its totient is φ = 320064550.

The previous prime is 320064533. The next prime is 320064587. The reversal of 320064551 is 155460023.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 320064551 - 2⁶ = 320064487 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 320064551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320064751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160032275 + 160032276.

It is an arithmetic number, because the mean of its divisors is an integer number (160032276).

Almost surely, 2^320064551 is an apocalyptic number.

320064551 is a deficient number, since it is larger than the sum of its proper divisors (1).

320064551 is an equidigital number, since it uses as much as digits as its factorization.

320064551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 320064551 is about 17890.3479843182. The cubic root of 320064551 is about 684.0363675191.

The spelling of 320064551 in words is "three hundred twenty million, sixty-four thousand, five hundred fifty-one".