1321526449 has 2 divisors, whose sum is σ = 1321526450. Its totient is φ = 1321526448.

The previous prime is 1321526417. The next prime is 1321526461. The reversal of 1321526449 is 9446251231.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1306316449 + 15210000 = 36143^2 + 3900^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321526449 - 2⁵ = 1321526417 is a prime.

It is not a weakly prime, because it can be changed into another prime (1321026449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660763224 + 660763225.

It is an arithmetic number, because the mean of its divisors is an integer number (660763225).

Almost surely, 2^1321526449 is an apocalyptic number.

It is an amenable number.

1321526449 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321526449 is an equidigital number, since it uses as much as digits as its factorization.

1321526449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 37.

The square root of 1321526449 is about 36352.8052425119. The cubic root of 1321526449 is about 1097.3839898963.

It can be divided in two parts, 132152 and 6449, that added together give a triangular number (138601 = T₅₂₆).

The spelling of 1321526449 in words is "one billion, three hundred twenty-one million, five hundred twenty-six thousand, four hundred forty-nine".