7942463521 has 4 divisors (see below), whose sum is σ = 7956984112. Its totient is φ = 7927942932.

The previous prime is 7942463519. The next prime is 7942463567. The reversal of 7942463521 is 1253642497.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1253642497 = 547 ⋅2291851.

It is a cyclic number.

It is not a de Polignac number, because 7942463521 - 2¹ = 7942463519 is a prime.

It is the 89121-st Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7942443521) by changing a digit.

It is a nontrivial repunit in base 89120.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7259475 + ... + 7260568.

It is an arithmetic number, because the mean of its divisors is an integer number (1989246028).

Almost surely, 2^7942463521 is an apocalyptic number.

It is an amenable number.

7942463521 is a deficient number, since it is larger than the sum of its proper divisors (14520591).

7942463521 is a wasteful number, since it uses less digits than its factorization.

7942463521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14520590.

The product of its digits is 362880, while the sum is 43.

The square root of 7942463521 is about 89120.5000042078. The cubic root of 7942463521 is about 1995.1937526620.

The spelling of 7942463521 in words is "seven billion, nine hundred forty-two million, four hundred sixty-three thousand, five hundred twenty-one".