75519421 has 2 divisors, whose sum is σ = 75519422. Its totient is φ = 75519420.

The previous prime is 75519397. The next prime is 75519427. The reversal of 75519421 is 12491557.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38613796 + 36905625 = 6214^2 + 6075^2 .

It is a cyclic number.

It is not a de Polignac number, because 75519421 - 2⁹ = 75518909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75519427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37759710 + 37759711.

It is an arithmetic number, because the mean of its divisors is an integer number (37759711).

Almost surely, 2^75519421 is an apocalyptic number.

It is an amenable number.

75519421 is a deficient number, since it is larger than the sum of its proper divisors (1).

75519421 is an equidigital number, since it uses as much as digits as its factorization.

75519421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12600, while the sum is 34.

The square root of 75519421 is about 8690.1910796023. The cubic root of 75519421 is about 422.6876418713.

The spelling of 75519421 in words is "seventy-five million, five hundred nineteen thousand, four hundred twenty-one".