1121042401 has 4 divisors (see below), whose sum is σ = 1121124292. Its totient is φ = 1120960512.

The previous prime is 1121042399. The next prime is 1121042431. The reversal of 1121042401 is 1042401211.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1042401211 = 1949 ⋅534839.

It can be written as a sum of positive squares in 2 ways, for example, as 141039376 + 980003025 = 11876^2 + 31305^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121042401 - 2¹ = 1121042399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1121042431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14880 + ... + 49633.

It is an arithmetic number, because the mean of its divisors is an integer number (280281073).

Almost surely, 2^1121042401 is an apocalyptic number.

It is an amenable number.

1121042401 is a deficient number, since it is larger than the sum of its proper divisors (81891).

1121042401 is an equidigital number, since it uses as much as digits as its factorization.

1121042401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81890.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 1121042401 is about 33481.9712830652. The cubic root of 1121042401 is about 1038.8209026736.

Adding to 1121042401 its reverse (1042401211), we get a palindrome (2163443612).

The spelling of 1121042401 in words is "one billion, one hundred twenty-one million, forty-two thousand, four hundred one".