7398642521 has 2 divisors, whose sum is σ = 7398642522. Its totient is φ = 7398642520.

The previous prime is 7398642473. The next prime is 7398642523. The reversal of 7398642521 is 1252468937.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6508455625 + 890186896 = 80675^2 + 29836^2 .

It is an emirp because it is prime and its reverse (1252468937) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7398642521 - 2¹⁸ = 7398380377 is a prime.

It is a super-2 number, since 2×7398642521² (a number of 21 digits) contains 22 as substring.

Together with 7398642523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7398642523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3699321260 + 3699321261.

It is an arithmetic number, because the mean of its divisors is an integer number (3699321261).

Almost surely, 2^7398642521 is an apocalyptic number.

It is an amenable number.

7398642521 is a deficient number, since it is larger than the sum of its proper divisors (1).

7398642521 is an equidigital number, since it uses as much as digits as its factorization.

7398642521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 47.

The square root of 7398642521 is about 86015.3621221233. The cubic root of 7398642521 is about 1948.5759948553.

The spelling of 7398642521 in words is "seven billion, three hundred ninety-eight million, six hundred forty-two thousand, five hundred twenty-one".