730131521 has 16 divisors (see below), whose sum is σ = 913991040. Its totient is φ = 568700160.

The previous prime is 730131517. The next prime is 730131539. The reversal of 730131521 is 125131037.

It is not a de Polignac number, because 730131521 - 2² = 730131517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (730131581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102335 + ... + 109236.

It is an arithmetic number, because the mean of its divisors is an integer number (57124440).

Almost surely, 2^730131521 is an apocalyptic number.

It is an amenable number.

730131521 is a deficient number, since it is larger than the sum of its proper divisors (183859519).

730131521 is a wasteful number, since it uses less digits than its factorization.

730131521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211624.

The product of its (nonzero) digits is 630, while the sum is 23.

The square root of 730131521 is about 27020.9459678968. The cubic root of 730131521 is about 900.4654057911.

Adding to 730131521 its reverse (125131037), we get a palindrome (855262558).

The spelling of 730131521 in words is "seven hundred thirty million, one hundred thirty-one thousand, five hundred twenty-one".