1211545499 has 8 divisors (see below), whose sum is σ = 1254098160. Its totient is φ = 1169044576.

The previous prime is 1211545481. The next prime is 1211545537. The reversal of 1211545499 is 9945451121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211545499 - 2¹⁶ = 1211479963 is a prime.

It is a super-2 number, since 2×1211545499² = 2935684992294318002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211545099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38204 + ... + 62310.

It is an arithmetic number, because the mean of its divisors is an integer number (156762270).

Almost surely, 2^1211545499 is an apocalyptic number.

1211545499 is a deficient number, since it is larger than the sum of its proper divisors (42552661).

1211545499 is a wasteful number, since it uses less digits than its factorization.

1211545499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25869.

The product of its digits is 64800, while the sum is 41.

The square root of 1211545499 is about 34807.2621589231. The cubic root of 1211545499 is about 1066.0557316741.

The spelling of 1211545499 in words is "one billion, two hundred eleven million, five hundred forty-five thousand, four hundred ninety-nine".