721048247 has 4 divisors (see below), whose sum is σ = 730175520. Its totient is φ = 711920976.

The previous prime is 721048231. The next prime is 721048249. The reversal of 721048247 is 742840127.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 721048247 - 2⁴ = 721048231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721048249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4563518 + ... + 4563675.

It is an arithmetic number, because the mean of its divisors is an integer number (182543880).

Almost surely, 2^721048247 is an apocalyptic number.

721048247 is a deficient number, since it is larger than the sum of its proper divisors (9127273).

721048247 is an equidigital number, since it uses as much as digits as its factorization.

721048247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9127272.

The product of its (nonzero) digits is 25088, while the sum is 35.

The square root of 721048247 is about 26852.3415552536. The cubic root of 721048247 is about 896.7157031236.

The spelling of 721048247 in words is "seven hundred twenty-one million, forty-eight thousand, two hundred forty-seven".