721430143 has 4 divisors (see below), whose sum is σ = 824491600. Its totient is φ = 618368688.

The previous prime is 721430131. The next prime is 721430153. The reversal of 721430143 is 341034127.

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

It is a de Polignac number, because none of the positive numbers 2^k-721430143 is a prime.

It is a super-2 number, since 2×721430143² = 1040922902458000898, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721430113) 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, 51530718 + ... + 51530731.

It is an arithmetic number, because the mean of its divisors is an integer number (206122900).

Almost surely, 2^721430143 is an apocalyptic number.

721430143 is a deficient number, since it is larger than the sum of its proper divisors (103061457).

721430143 is a wasteful number, since it uses less digits than its factorization.

721430143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103061456.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 721430143 is about 26859.4516511414. The cubic root of 721430143 is about 896.8739873533.

The spelling of 721430143 in words is "seven hundred twenty-one million, four hundred thirty thousand, one hundred forty-three".