1331521423 has 2 divisors, whose sum is σ = 1331521424. Its totient is φ = 1331521422.

The previous prime is 1331521361. The next prime is 1331521439. The reversal of 1331521423 is 3241251331.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1331521423 - 2¹³ = 1331513231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1331521483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665760711 + 665760712.

It is an arithmetic number, because the mean of its divisors is an integer number (665760712).

Almost surely, 2^1331521423 is an apocalyptic number.

1331521423 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331521423 is an equidigital number, since it uses as much as digits as its factorization.

1331521423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 25.

The square root of 1331521423 is about 36490.0181282498. The cubic root of 1331521423 is about 1100.1436239463.

Adding to 1331521423 its reverse (3241251331), we get a palindrome (4572772754).

The spelling of 1331521423 in words is "one billion, three hundred thirty-one million, five hundred twenty-one thousand, four hundred twenty-three".