1155556042 has 4 divisors (see below), whose sum is σ = 1733334066. Its totient is φ = 577778020.

The previous prime is 1155555997. The next prime is 1155556043. The reversal of 1155556042 is 2406555511.

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

It can be written as a sum of positive squares in only one way, i.e., 949317721 + 206238321 = 30811^2 + 14361^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1155555989 and 1155556007.

It is not an unprimeable number, because it can be changed into a prime (1155556043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 288889009 + ... + 288889012.

Almost surely, 2^1155556042 is an apocalyptic number.

1155556042 is a deficient number, since it is larger than the sum of its proper divisors (577778024).

1155556042 is an equidigital number, since it uses as much as digits as its factorization.

1155556042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577778023.

The product of its (nonzero) digits is 30000, while the sum is 34.

The square root of 1155556042 is about 33993.4705789215. The cubic root of 1155556042 is about 1049.3740916696.

The spelling of 1155556042 in words is "one billion, one hundred fifty-five million, five hundred fifty-six thousand, forty-two".