1457507521 has 4 divisors (see below), whose sum is σ = 1473884100. Its totient is φ = 1441130944.

The previous prime is 1457507507. The next prime is 1457507531. The reversal of 1457507521 is 1257057541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1257057541 = 20641 ⋅60901.

It can be written as a sum of positive squares in 2 ways, for example, as 586608400 + 870899121 = 24220^2 + 29511^2 .

It is a cyclic number.

It is not a de Polignac number, because 1457507521 - 2¹¹ = 1457505473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1457507531) 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, 8188156 + ... + 8188333.

It is an arithmetic number, because the mean of its divisors is an integer number (368471025).

Almost surely, 2^1457507521 is an apocalyptic number.

It is an amenable number.

1457507521 is a deficient number, since it is larger than the sum of its proper divisors (16376579).

1457507521 is an equidigital number, since it uses as much as digits as its factorization.

1457507521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16376578.

The product of its (nonzero) digits is 49000, while the sum is 37.

The square root of 1457507521 is about 38177.3168386674. The cubic root of 1457507521 is about 1133.8012587873.

The spelling of 1457507521 in words is "one billion, four hundred fifty-seven million, five hundred seven thousand, five hundred twenty-one".