1522749999 has 4 divisors (see below), whose sum is σ = 2030333336. Its totient is φ = 1015166664.

The previous prime is 1522749971. The next prime is 1522750001. The reversal of 1522749999 is 9999472251.

1522749999 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1522749999 - 2⁸ = 1522749743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1522749299) 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, 253791664 + ... + 253791669.

It is an arithmetic number, because the mean of its divisors is an integer number (507583334).

Almost surely, 2^1522749999 is an apocalyptic number.

1522749999 is a deficient number, since it is larger than the sum of its proper divisors (507583337).

1522749999 is an equidigital number, since it uses as much as digits as its factorization.

1522749999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507583336.

The product of its digits is 3674160, while the sum is 57.

The square root of 1522749999 is about 39022.4294348776. The cubic root of 1522749999 is about 1150.4723954635.

The spelling of 1522749999 in words is "one billion, five hundred twenty-two million, seven hundred forty-nine thousand, nine hundred ninety-nine".