721146130 has 16 divisors (see below), whose sum is σ = 1329723864. Its totient is φ = 281422720.

The previous prime is 721146119. The next prime is 721146131. The reversal of 721146130 is 31641127.

It can be written as a sum of positive squares in 4 ways, for example, as 473367049 + 247779081 = 21757^2 + 15741^2 .

It is a junction number, because it is equal to n+sod(n) for n = 721146095 and 721146104.

It is not an unprimeable number, because it can be changed into a prime (721146131) 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, 879037 + ... + 879856.

Almost surely, 2^721146130 is an apocalyptic number.

721146130 is a deficient number, since it is larger than the sum of its proper divisors (608577734).

721146130 is a wasteful number, since it uses less digits than its factorization.

721146130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1758941.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 721146130 is about 26854.1641091284. The cubic root of 721146130 is about 896.7562779635.

Adding to 721146130 its reverse (31641127), we get a palindrome (752787257).

The spelling of 721146130 in words is "seven hundred twenty-one million, one hundred forty-six thousand, one hundred thirty".