1209091242 has 8 divisors (see below), whose sum is σ = 2418182496. Its totient is φ = 403030412.

The previous prime is 1209091237. The next prime is 1209091249. The reversal of 1209091242 is 2421909021.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

1209091242 is an admirable number.

It is a super-2 number, since 2×1209091242² = 2923803262962205128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1209091249) 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, 100757598 + ... + 100757609.

It is an arithmetic number, because the mean of its divisors is an integer number (302272812).

Almost surely, 2^1209091242 is an apocalyptic number.

1209091242 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1209091242 is a wasteful number, since it uses less digits than its factorization.

1209091242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201515212.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 1209091242 is about 34771.9893304942. The cubic root of 1209091242 is about 1065.3354001033.

The spelling of 1209091242 in words is "one billion, two hundred nine million, ninety-one thousand, two hundred forty-two".