7854872521 has 2 divisors, whose sum is σ = 7854872522. Its totient is φ = 7854872520.

The previous prime is 7854872507. The next prime is 7854872533. The reversal of 7854872521 is 1252784587.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6413607225 + 1441265296 = 80085^2 + 37964^2 .

It is a cyclic number.

It is not a de Polignac number, because 7854872521 - 2¹¹ = 7854870473 is a prime.

It is not a weakly prime, because it can be changed into another prime (7854872581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3927436260 + 3927436261.

It is an arithmetic number, because the mean of its divisors is an integer number (3927436261).

Almost surely, 2^7854872521 is an apocalyptic number.

It is an amenable number.

7854872521 is a deficient number, since it is larger than the sum of its proper divisors (1).

7854872521 is an equidigital number, since it uses as much as digits as its factorization.

7854872521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1254400, while the sum is 49.

The square root of 7854872521 is about 88627.7186945484. The cubic root of 7854872521 is about 1987.8321654447.

The spelling of 7854872521 in words is "seven billion, eight hundred fifty-four million, eight hundred seventy-two thousand, five hundred twenty-one".