1370809509 has 4 divisors (see below), whose sum is σ = 1827746016. Its totient is φ = 913873004.

The previous prime is 1370809493. The next prime is 1370809519. The reversal of 1370809509 is 9059080731.

It is a happy number.

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 1370809509 - 2⁴ = 1370809493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1370809519) 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, 228468249 + ... + 228468254.

It is an arithmetic number, because the mean of its divisors is an integer number (456936504).

Almost surely, 2^1370809509 is an apocalyptic number.

It is an amenable number.

1370809509 is a deficient number, since it is larger than the sum of its proper divisors (456936507).

1370809509 is an equidigital number, since it uses as much as digits as its factorization.

1370809509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456936506.

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 1370809509 is about 37024.4447493815. Note that the first 3 decimals coincide. The cubic root of 1370809509 is about 1110.8592510849.

The spelling of 1370809509 in words is "one billion, three hundred seventy million, eight hundred nine thousand, five hundred nine".