1145251421 has 2 divisors, whose sum is σ = 1145251422. Its totient is φ = 1145251420.

The previous prime is 1145251403. The next prime is 1145251439. The reversal of 1145251421 is 1241525411.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (1145251403) and next prime (1145251439).

It can be written as a sum of positive squares in only one way, i.e., 729540100 + 415711321 = 27010^2 + 20389^2 .

It is a cyclic number.

It is not a de Polignac number, because 1145251421 - 2⁶ = 1145251357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1145251451) 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, 572625710 + 572625711.

It is an arithmetic number, because the mean of its divisors is an integer number (572625711).

Almost surely, 2^1145251421 is an apocalyptic number.

It is an amenable number.

1145251421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1145251421 is an equidigital number, since it uses as much as digits as its factorization.

1145251421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1600, while the sum is 26.

The square root of 1145251421 is about 33841.5635129348. The cubic root of 1145251421 is about 1046.2455241857.

Adding to 1145251421 its reverse (1241525411), we get a palindrome (2386776832).

The spelling of 1145251421 in words is "one billion, one hundred forty-five million, two hundred fifty-one thousand, four hundred twenty-one".