405116509 has 4 divisors (see below), whose sum is σ = 462990304. Its totient is φ = 347242716.

The previous prime is 405116507. The next prime is 405116561. The reversal of 405116509 is 905611504.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 405116509 - 2¹ = 405116507 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405116501) 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, 28936887 + ... + 28936900.

It is an arithmetic number, because the mean of its divisors is an integer number (115747576).

Almost surely, 2^405116509 is an apocalyptic number.

It is an amenable number.

405116509 is a deficient number, since it is larger than the sum of its proper divisors (57873795).

405116509 is an equidigital number, since it uses as much as digits as its factorization.

405116509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57873794.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 405116509 is about 20127.5062787222. The cubic root of 405116509 is about 739.9345626334.

The spelling of 405116509 in words is "four hundred five million, one hundred sixteen thousand, five hundred nine".