721050261 has 4 divisors (see below), whose sum is σ = 961400352. Its totient is φ = 480700172.

The previous prime is 721050241. The next prime is 721050271. The reversal of 721050261 is 162050127.

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 721050261 - 2²⁹ = 184179349 is a prime.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721050241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120175041 + ... + 120175046.

It is an arithmetic number, because the mean of its divisors is an integer number (240350088).

Almost surely, 2^721050261 is an apocalyptic number.

It is an amenable number.

721050261 is a deficient number, since it is larger than the sum of its proper divisors (240350091).

721050261 is a wasteful number, since it uses less digits than its factorization.

721050261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240350090.

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 721050261 is about 26852.3790566125. The cubic root of 721050261 is about 896.7165380116.

The spelling of 721050261 in words is "seven hundred twenty-one million, fifty thousand, two hundred sixty-one".