1165211455 has 4 divisors (see below), whose sum is σ = 1398253752. Its totient is φ = 932169160.

The previous prime is 1165211393. The next prime is 1165211479. The reversal of 1165211455 is 5541125611.

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

It is not a de Polignac number, because 1165211455 - 2¹¹ = 1165209407 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116521141 + ... + 116521150.

It is an arithmetic number, because the mean of its divisors is an integer number (349563438).

Almost surely, 2^1165211455 is an apocalyptic number.

1165211455 is a deficient number, since it is larger than the sum of its proper divisors (233042297).

1165211455 is an equidigital number, since it uses as much as digits as its factorization.

1165211455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233042296.

The product of its digits is 6000, while the sum is 31.

The square root of 1165211455 is about 34135.1937888157. The cubic root of 1165211455 is about 1052.2887203485.

The spelling of 1165211455 in words is "one billion, one hundred sixty-five million, two hundred eleven thousand, four hundred fifty-five".