75642521 has 2 divisors, whose sum is σ = 75642522. Its totient is φ = 75642520.

The previous prime is 75642517. The next prime is 75642533. The reversal of 75642521 is 12524657.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68244121 + 7398400 = 8261^2 + 2720^2 .

It is a cyclic number.

It is not a de Polignac number, because 75642521 - 2² = 75642517 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (75642551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37821260 + 37821261.

It is an arithmetic number, because the mean of its divisors is an integer number (37821261).

Almost surely, 2^75642521 is an apocalyptic number.

It is an amenable number.

75642521 is a deficient number, since it is larger than the sum of its proper divisors (1).

75642521 is an equidigital number, since it uses as much as digits as its factorization.

75642521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16800, while the sum is 32.

The square root of 75642521 is about 8697.2708937919. The cubic root of 75642521 is about 422.9171837192.

The spelling of 75642521 in words is "seventy-five million, six hundred forty-two thousand, five hundred twenty-one".