1555216233 has 8 divisors (see below), whose sum is σ = 2074489248. Its totient is φ = 1036377024.

The previous prime is 1555216211. The next prime is 1555216241. The reversal of 1555216233 is 3326125551.

It is a happy number.

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

It is not a de Polignac number, because 1555216233 - 2²⁴ = 1538439017 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1555216194 and 1555216203.

It is not an unprimeable number, because it can be changed into a prime (1555216433) 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, 99991 + ... + 114492.

It is an arithmetic number, because the mean of its divisors is an integer number (259311156).

Almost surely, 2^1555216233 is an apocalyptic number.

It is an amenable number.

1555216233 is a deficient number, since it is larger than the sum of its proper divisors (519273015).

1555216233 is a wasteful number, since it uses less digits than its factorization.

1555216233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216903.

The product of its digits is 27000, while the sum is 33.

The square root of 1555216233 is about 39436.2299541931. The cubic root of 1555216233 is about 1158.5912925799.

The spelling of 1555216233 in words is "one billion, five hundred fifty-five million, two hundred sixteen thousand, two hundred thirty-three".