721512067 has 2 divisors, whose sum is σ = 721512068. Its totient is φ = 721512066.

The previous prime is 721512059. The next prime is 721512089. The reversal of 721512067 is 760215127.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 721512067 - 2³ = 721512059 is a prime.

It is a super-2 number, since 2×721512067² = 1041159325653224978, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (721512367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360756033 + 360756034.

It is an arithmetic number, because the mean of its divisors is an integer number (360756034).

Almost surely, 2^721512067 is an apocalyptic number.

721512067 is a deficient number, since it is larger than the sum of its proper divisors (1).

721512067 is an equidigital number, since it uses as much as digits as its factorization.

721512067 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5880, while the sum is 31.

The square root of 721512067 is about 26860.9766575975. The cubic root of 721512067 is about 896.9079350724.

The spelling of 721512067 in words is "seven hundred twenty-one million, five hundred twelve thousand, sixty-seven".