7539424421 has 2 divisors, whose sum is σ = 7539424422. Its totient is φ = 7539424420.

The previous prime is 7539424369. The next prime is 7539424429. The reversal of 7539424421 is 1244249357.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6882527521 + 656896900 = 82961^2 + 25630^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7539424421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7539424429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3769712210 + 3769712211.

It is an arithmetic number, because the mean of its divisors is an integer number (3769712211).

Almost surely, 2^7539424421 is an apocalyptic number.

It is an amenable number.

7539424421 is a deficient number, since it is larger than the sum of its proper divisors (1).

7539424421 is an equidigital number, since it uses as much as digits as its factorization.

7539424421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 41.

The square root of 7539424421 is about 86829.8590405397. The cubic root of 7539424421 is about 1960.8576370424.

The spelling of 7539424421 in words is "seven billion, five hundred thirty-nine million, four hundred twenty-four thousand, four hundred twenty-one".