1521797679 has 32 divisors (see below), whose sum is σ = 2354784000. Its totient is φ = 970343712.

The previous prime is 1521797663. The next prime is 1521797743. The reversal of 1521797679 is 9767971251.

It is a happy number.

It is not a de Polignac number, because 1521797679 - 2⁴ = 1521797663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1521797659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46032 + ... + 71850.

It is an arithmetic number, because the mean of its divisors is an integer number (73587000).

Almost surely, 2^1521797679 is an apocalyptic number.

1521797679 is a deficient number, since it is larger than the sum of its proper divisors (832986321).

1521797679 is a wasteful number, since it uses less digits than its factorization.

1521797679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25924 (or 25918 counting only the distinct ones).

The product of its digits is 1666980, while the sum is 54.

The square root of 1521797679 is about 39010.2253133714. The cubic root of 1521797679 is about 1150.2325122807.

It can be divided in two parts, 15217 and 97679, that added together give a square (112896 = 336²).

The spelling of 1521797679 in words is "one billion, five hundred twenty-one million, seven hundred ninety-seven thousand, six hundred seventy-nine".