1155897829 has 4 divisors (see below), whose sum is σ = 1177707276. Its totient is φ = 1134088384.

The previous prime is 1155897823. The next prime is 1155897839. The reversal of 1155897829 is 9287985511.

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 723341025 + 432556804 = 26895^2 + 20798^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155897829 - 2⁹ = 1155897317 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1155897829.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155897823) 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, 10904644 + ... + 10904749.

It is an arithmetic number, because the mean of its divisors is an integer number (294426819).

Almost surely, 2^1155897829 is an apocalyptic number.

It is an amenable number.

1155897829 is a deficient number, since it is larger than the sum of its proper divisors (21809447).

1155897829 is an equidigital number, since it uses as much as digits as its factorization.

1155897829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21809446.

The product of its digits is 1814400, while the sum is 55.

The square root of 1155897829 is about 33998.4974520934. The cubic root of 1155897829 is about 1049.4775417416.

The spelling of 1155897829 in words is "one billion, one hundred fifty-five million, eight hundred ninety-seven thousand, eight hundred twenty-nine".