721277801 has 4 divisors (see below), whose sum is σ = 722421504. Its totient is φ = 720134100.

The previous prime is 721277779. The next prime is 721277803. The reversal of 721277801 is 108772127.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 721277801 - 2¹⁴ = 721261417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721277803) 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 3 ways as a sum of consecutive naturals, for example, 570905 + ... + 572166.

It is an arithmetic number, because the mean of its divisors is an integer number (180605376).

Almost surely, 2^721277801 is an apocalyptic number.

It is an amenable number.

721277801 is a deficient number, since it is larger than the sum of its proper divisors (1143703).

721277801 is a wasteful number, since it uses less digits than its factorization.

721277801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1143702.

The product of its (nonzero) digits is 10976, while the sum is 35.

The square root of 721277801 is about 26856.6155909489. The cubic root of 721277801 is about 896.8108529451.

The spelling of 721277801 in words is "seven hundred twenty-one million, two hundred seventy-seven thousand, eight hundred one".