1155156542 has 4 divisors (see below), whose sum is σ = 1732734816. Its totient is φ = 577578270.

The previous prime is 1155156533. The next prime is 1155156589. The reversal of 1155156542 is 2456515511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2456515511 = 10331 ⋅237781.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 288789134 + ... + 288789137.

It is an arithmetic number, because the mean of its divisors is an integer number (433183704).

Almost surely, 2^1155156542 is an apocalyptic number.

1155156542 is a deficient number, since it is larger than the sum of its proper divisors (577578274).

1155156542 is an equidigital number, since it uses as much as digits as its factorization.

1155156542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577578273.

The product of its digits is 30000, while the sum is 35.

The square root of 1155156542 is about 33987.5939424961. The cubic root of 1155156542 is about 1049.2531475079.

The spelling of 1155156542 in words is "one billion, one hundred fifty-five million, one hundred fifty-six thousand, five hundred forty-two".