7351661521 has 2 divisors, whose sum is σ = 7351661522. Its totient is φ = 7351661520.

The previous prime is 7351661491. The next prime is 7351661549. The reversal of 7351661521 is 1251661537.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6738603921 + 613057600 = 82089^2 + 24760^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7351661521 is a prime.

It is not a weakly prime, because it can be changed into another prime (7351661561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3675830760 + 3675830761.

It is an arithmetic number, because the mean of its divisors is an integer number (3675830761).

Almost surely, 2^7351661521 is an apocalyptic number.

It is an amenable number.

7351661521 is a deficient number, since it is larger than the sum of its proper divisors (1).

7351661521 is an equidigital number, since it uses as much as digits as its factorization.

7351661521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37800, while the sum is 37.

The square root of 7351661521 is about 85741.8306370934. The cubic root of 7351661521 is about 1944.4427814116.

The spelling of 7351661521 in words is "seven billion, three hundred fifty-one million, six hundred sixty-one thousand, five hundred twenty-one".