815123479 has 2 divisors, whose sum is σ = 815123480. Its totient is φ = 815123478.

The previous prime is 815123461. The next prime is 815123483. The reversal of 815123479 is 974321518.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-815123479 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (815123879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407561739 + 407561740.

It is an arithmetic number, because the mean of its divisors is an integer number (407561740).

Almost surely, 2^815123479 is an apocalyptic number.

815123479 is a deficient number, since it is larger than the sum of its proper divisors (1).

815123479 is an equidigital number, since it uses as much as digits as its factorization.

815123479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 40.

The square root of 815123479 is about 28550.3674056920. The cubic root of 815123479 is about 934.1310347638.

The spelling of 815123479 in words is "eight hundred fifteen million, one hundred twenty-three thousand, four hundred seventy-nine".