7351542521 has 4 divisors (see below), whose sum is σ = 7351725732. Its totient is φ = 7351359312.

The previous prime is 7351542503. The next prime is 7351542581. The reversal of 7351542521 is 1252451537.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1252451537 = 239 ⋅5240383.

It can be written as a sum of positive squares in 2 ways, for example, as 4863528121 + 2488014400 = 69739^2 + 49880^2 .

It is a cyclic number.

It is not a de Polignac number, because 7351542521 - 2²⁶ = 7284433657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7351542581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2570 + ... + 121283.

It is an arithmetic number, because the mean of its divisors is an integer number (1837931433).

Almost surely, 2^7351542521 is an apocalyptic number.

It is an amenable number.

7351542521 is a deficient number, since it is larger than the sum of its proper divisors (183211).

7351542521 is a wasteful number, since it uses less digits than its factorization.

7351542521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183210.

The product of its digits is 42000, while the sum is 35.

The square root of 7351542521 is about 85741.1366906224. The cubic root of 7351542521 is about 1944.4322899085.

The spelling of 7351542521 in words is "seven billion, three hundred fifty-one million, five hundred forty-two thousand, five hundred twenty-one".