320121247 has 2 divisors, whose sum is σ = 320121248. Its totient is φ = 320121246.

The previous prime is 320121211. The next prime is 320121251. The reversal of 320121247 is 742121023.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320121247 is a prime.

It is a super-2 number, since 2×320121247² = 204955225561670018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320121287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160060623 + 160060624.

It is an arithmetic number, because the mean of its divisors is an integer number (160060624).

Almost surely, 2^320121247 is an apocalyptic number.

320121247 is a deficient number, since it is larger than the sum of its proper divisors (1).

320121247 is an equidigital number, since it uses as much as digits as its factorization.

320121247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 320121247 is about 17891.9324557187. The cubic root of 320121247 is about 684.0767550347.

The spelling of 320121247 in words is "three hundred twenty million, one hundred twenty-one thousand, two hundred forty-seven".