75212521 has 2 divisors, whose sum is σ = 75212522. Its totient is φ = 75212520.

The previous prime is 75212513. The next prime is 75212537. The reversal of 75212521 is 12521257.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74580496 + 632025 = 8636^2 + 795^2 .

It is a cyclic number.

It is not a de Polignac number, because 75212521 - 2³ = 75212513 is a prime.

It is not a weakly prime, because it can be changed into another prime (75212581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37606260 + 37606261.

It is an arithmetic number, because the mean of its divisors is an integer number (37606261).

Almost surely, 2^75212521 is an apocalyptic number.

It is an amenable number.

75212521 is a deficient number, since it is larger than the sum of its proper divisors (1).

75212521 is an equidigital number, since it uses as much as digits as its factorization.

75212521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1400, while the sum is 25.

The square root of 75212521 is about 8672.5152637513. The cubic root of 75212521 is about 422.1142840148.

Adding to 75212521 its reverse (12521257), we get a palindrome (87733778).

The spelling of 75212521 in words is "seventy-five million, two hundred twelve thousand, five hundred twenty-one".