1555142233 has 4 divisors (see below), whose sum is σ = 1556421300. Its totient is φ = 1553863168.

The previous prime is 1555142221. The next prime is 1555142291. The reversal of 1555142233 is 3322415551.

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 632623104 + 922519129 = 25152^2 + 30373^2 .

It is a cyclic number.

It is not a de Polignac number, because 1555142233 - 2²⁵ = 1521587801 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1555142195 and 1555142204.

It is not an unprimeable number, because it can be changed into a prime (1555142203) 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, 637708 + ... + 640141.

It is an arithmetic number, because the mean of its divisors is an integer number (389105325).

Almost surely, 2^1555142233 is an apocalyptic number.

It is an amenable number.

1555142233 is a deficient number, since it is larger than the sum of its proper divisors (1279067).

1555142233 is a wasteful number, since it uses less digits than its factorization.

1555142233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1279066.

The product of its digits is 18000, while the sum is 31.

The square root of 1555142233 is about 39435.2917194738. The cubic root of 1555142233 is about 1158.5729163323.

Adding to 1555142233 its reverse (3322415551), we get a palindrome (4877557784).

The spelling of 1555142233 in words is "one billion, five hundred fifty-five million, one hundred forty-two thousand, two hundred thirty-three".