721313151 has 8 divisors (see below), whose sum is σ = 1035731760. Its totient is φ = 443884992.

The previous prime is 721313147. The next prime is 721313161. The reversal of 721313151 is 151313127.

It is a happy number.

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

It is not a de Polignac number, because 721313151 - 2² = 721313147 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721313101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9247566 + ... + 9247643.

It is an arithmetic number, because the mean of its divisors is an integer number (129466470).

Almost surely, 2^721313151 is an apocalyptic number.

721313151 is a deficient number, since it is larger than the sum of its proper divisors (314418609).

721313151 is a wasteful number, since it uses less digits than its factorization.

721313151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18495225.

The product of its digits is 630, while the sum is 24.

The square root of 721313151 is about 26857.2737075080. The cubic root of 721313151 is about 896.8255036782.

Subtracting from 721313151 its sum of digits (24), we obtain a palindrome (721313127).

Adding to 721313151 its reverse (151313127), we get a palindrome (872626278).

The spelling of 721313151 in words is "seven hundred twenty-one million, three hundred thirteen thousand, one hundred fifty-one".