531521345 has 4 divisors (see below), whose sum is σ = 637825620. Its totient is φ = 425217072.

The previous prime is 531521339. The next prime is 531521351. The reversal of 531521345 is 543125135.

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

It is an interprime number because it is at equal distance from previous prime (531521339) and next prime (531521351).

It can be written as a sum of positive squares in 2 ways, for example, as 103693489 + 427827856 = 10183^2 + 20684^2 .

It is a cyclic number.

It is not a de Polignac number, because 531521345 - 2¹⁶ = 531455809 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53152130 + ... + 53152139.

It is an arithmetic number, because the mean of its divisors is an integer number (159456405).

Almost surely, 2^531521345 is an apocalyptic number.

It is an amenable number.

531521345 is a deficient number, since it is larger than the sum of its proper divisors (106304275).

531521345 is a wasteful number, since it uses less digits than its factorization.

531521345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106304274.

The product of its digits is 9000, while the sum is 29.

The square root of 531521345 is about 23054.7466912998. The cubic root of 531521345 is about 810.0408174320.

The spelling of 531521345 in words is "five hundred thirty-one million, five hundred twenty-one thousand, three hundred forty-five".