1131325421 has 2 divisors, whose sum is σ = 1131325422. Its totient is φ = 1131325420.

The previous prime is 1131325411. The next prime is 1131325451. The reversal of 1131325421 is 1245231311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 811452196 + 319873225 = 28486^2 + 17885^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131325421 - 2¹⁴ = 1131309037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131325411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565662710 + 565662711.

It is an arithmetic number, because the mean of its divisors is an integer number (565662711).

Almost surely, 2^1131325421 is an apocalyptic number.

It is an amenable number.

1131325421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131325421 is an equidigital number, since it uses as much as digits as its factorization.

1131325421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 23.

The square root of 1131325421 is about 33635.1812987532. The cubic root of 1131325421 is about 1041.9875149396.

Adding to 1131325421 its reverse (1245231311), we get a palindrome (2376556732).

The spelling of 1131325421 in words is "one billion, one hundred thirty-one million, three hundred twenty-five thousand, four hundred twenty-one".