1520715479 has 4 divisors (see below), whose sum is σ = 1521407976. Its totient is φ = 1520022984.

The previous prime is 1520715473. The next prime is 1520715563. The reversal of 1520715479 is 9745170251.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9745170251 = 211 ⋅46185641.

It is a cyclic number.

It is not a de Polignac number, because 1520715479 - 2⁸ = 1520715223 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 (1520715473) 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, 342944 + ... + 347349.

It is an arithmetic number, because the mean of its divisors is an integer number (380351994).

Almost surely, 2^1520715479 is an apocalyptic number.

1520715479 is a deficient number, since it is larger than the sum of its proper divisors (692497).

1520715479 is an equidigital number, since it uses as much as digits as its factorization.

1520715479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692496.

The product of its (nonzero) digits is 88200, while the sum is 41.

The square root of 1520715479 is about 38996.3521242693. The cubic root of 1520715479 is about 1149.9597916629.

The spelling of 1520715479 in words is "one billion, five hundred twenty million, seven hundred fifteen thousand, four hundred seventy-nine".