1245090121 has 12 divisors (see below), whose sum is σ = 1440602800. Its totient is φ = 1072324440.

The previous prime is 1245090103. The next prime is 1245090139. The reversal of 1245090121 is 1210905421.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1245090103) and next prime (1245090139).

It is not a de Polignac number, because 1245090121 - 2²⁷ = 1110872393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1245090181) 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 in 11 ways as a sum of consecutive naturals, for example, 268491 + ... + 273088.

Almost surely, 2^1245090121 is an apocalyptic number.

1245090121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1245090121 is a deficient number, since it is larger than the sum of its proper divisors (195512679).

1245090121 is a wasteful number, since it uses less digits than its factorization.

1245090121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541620 (or 541609 counting only the distinct ones).

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

The square root of 1245090121 is about 35285.8345657291. The cubic root of 1245090121 is about 1075.8050925162.

Adding to 1245090121 its reverse (1210905421), we get a palindrome (2455995542).

The spelling of 1245090121 in words is "one billion, two hundred forty-five million, ninety thousand, one hundred twenty-one".