72521503 has 2 divisors, whose sum is σ = 72521504. Its totient is φ = 72521502.

The previous prime is 72521467. The next prime is 72521531. The reversal of 72521503 is 30512527.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72521503 - 2¹⁷ = 72390431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72521003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36260751 + 36260752.

It is an arithmetic number, because the mean of its divisors is an integer number (36260752).

Almost surely, 2^72521503 is an apocalyptic number.

72521503 is a deficient number, since it is larger than the sum of its proper divisors (1).

72521503 is an equidigital number, since it uses as much as digits as its factorization.

72521503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 72521503 is about 8515.9557889881. The cubic root of 72521503 is about 417.0187659167.

The spelling of 72521503 in words is "seventy-two million, five hundred twenty-one thousand, five hundred three".