1091102542 has 4 divisors (see below), whose sum is σ = 1636653816. Its totient is φ = 545551270.

The previous prime is 1091102527. The next prime is 1091102549. The reversal of 1091102542 is 2452011901.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2452011901 = 281 ⋅8726021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091102549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272775634 + ... + 272775637.

It is an arithmetic number, because the mean of its divisors is an integer number (409163454).

Almost surely, 2^1091102542 is an apocalyptic number.

1091102542 is a deficient number, since it is larger than the sum of its proper divisors (545551274).

1091102542 is an equidigital number, since it uses as much as digits as its factorization.

1091102542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545551273.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 1091102542 is about 33031.8413352934. The cubic root of 1091102542 is about 1029.4893443794.

The spelling of 1091102542 in words is "one billion, ninety-one million, one hundred two thousand, five hundred forty-two".