1217387449 has 4 divisors (see below), whose sum is σ = 1219527540. Its totient is φ = 1215247360.

The previous prime is 1217387429. The next prime is 1217387461. The reversal of 1217387449 is 9447837121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 786409849 + 430977600 = 28043^2 + 20760^2 .

It is a cyclic number.

It is not a de Polignac number, because 1217387449 - 2¹⁹ = 1216863161 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1217387399 and 1217387408.

It is not an unprimeable number, because it can be changed into a prime (1217387429) 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, 1069192 + ... + 1070329.

It is an arithmetic number, because the mean of its divisors is an integer number (304881885).

Almost surely, 2^1217387449 is an apocalyptic number.

It is an amenable number.

1217387449 is a deficient number, since it is larger than the sum of its proper divisors (2140091).

1217387449 is an equidigital number, since it uses as much as digits as its factorization.

1217387449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2140090.

The product of its digits is 338688, while the sum is 46.

The square root of 1217387449 is about 34891.0797912590. The cubic root of 1217387449 is about 1067.7664559801.

The spelling of 1217387449 in words is "one billion, two hundred seventeen million, three hundred eighty-seven thousand, four hundred forty-nine".