75321513 has 6 divisors (see below), whose sum is σ = 108797754. Its totient is φ = 50214336.

The previous prime is 75321511. The next prime is 75321517. The reversal of 75321513 is 31512357.

It can be written as a sum of positive squares in only one way, i.e., 72539289 + 2782224 = 8517^2 + 1668^2 .

It is not a de Polignac number, because 75321513 - 2¹ = 75321511 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (75321511) 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 5 ways as a sum of consecutive naturals, for example, 4184520 + ... + 4184537.

It is an arithmetic number, because the mean of its divisors is an integer number (18132959).

Almost surely, 2^75321513 is an apocalyptic number.

It is an amenable number.

75321513 is a deficient number, since it is larger than the sum of its proper divisors (33476241).

75321513 is a wasteful number, since it uses less digits than its factorization.

75321513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8369063 (or 8369060 counting only the distinct ones).

The product of its digits is 3150, while the sum is 27.

The square root of 75321513 is about 8678.7967483978. The cubic root of 75321513 is about 422.3180837459.

It can be divided in two parts, 7532 and 1513, that added together give a triangular number (9045 = T₁₃₄).

The spelling of 75321513 in words is "seventy-five million, three hundred twenty-one thousand, five hundred thirteen".