1211042542 has 16 divisors (see below), whose sum is σ = 1840663440. Its totient is φ = 597505792.

The previous prime is 1211042537. The next prime is 1211042603. The reversal of 1211042542 is 2452401121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150288 + ... + 158140.

It is an arithmetic number, because the mean of its divisors is an integer number (115041465).

Almost surely, 2^1211042542 is an apocalyptic number.

1211042542 is a deficient number, since it is larger than the sum of its proper divisors (629620898).

1211042542 is an equidigital number, since it uses as much as digits as its factorization.

1211042542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8867.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 1211042542 is about 34800.0365229693. The cubic root of 1211042542 is about 1065.9081916364.

Adding to 1211042542 its reverse (2452401121), we get a palindrome (3663443663).

The spelling of 1211042542 in words is "one billion, two hundred eleven million, forty-two thousand, five hundred forty-two".