721140081 has 8 divisors (see below), whose sum is σ = 961657920. Its totient is φ = 480691152.

The previous prime is 721140053. The next prime is 721140083. The reversal of 721140081 is 180041127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 721140081 - 2¹⁵ = 721107313 is a prime.

It is a super-2 number, since 2×721140081² = 1040086032849373122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (721140083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16791 + ... + 41523.

It is an arithmetic number, because the mean of its divisors is an integer number (120207240).

Almost surely, 2^721140081 is an apocalyptic number.

It is an amenable number.

721140081 is a deficient number, since it is larger than the sum of its proper divisors (240517839).

721140081 is a wasteful number, since it uses less digits than its factorization.

721140081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34455.

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 721140081 is about 26854.0514820390. The cubic root of 721140081 is about 896.7537706151.

The spelling of 721140081 in words is "seven hundred twenty-one million, one hundred forty thousand, eighty-one".