1229155565 has 8 divisors (see below), whose sum is σ = 1609076448. Its totient is φ = 893931280.

The previous prime is 1229155519. The next prime is 1229155567. The reversal of 1229155565 is 5655519221.

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

It is not a de Polignac number, because 1229155565 - 2⁸ = 1229155309 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1229155567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11174087 + ... + 11174196.

It is an arithmetic number, because the mean of its divisors is an integer number (201134556).

Almost surely, 2^1229155565 is an apocalyptic number.

It is an amenable number.

1229155565 is a deficient number, since it is larger than the sum of its proper divisors (379920883).

1229155565 is a wasteful number, since it uses less digits than its factorization.

1229155565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22348299.

The product of its digits is 135000, while the sum is 41.

The square root of 1229155565 is about 35059.3149533758. The cubic root of 1229155565 is about 1071.1960204666.

The spelling of 1229155565 in words is "one billion, two hundred twenty-nine million, one hundred fifty-five thousand, five hundred sixty-five".