1225521487 has 2 divisors, whose sum is σ = 1225521488. Its totient is φ = 1225521486.

The previous prime is 1225521463. The next prime is 1225521523. The reversal of 1225521487 is 7841255221.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1225521487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1225531487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612760743 + 612760744.

It is an arithmetic number, because the mean of its divisors is an integer number (612760744).

Almost surely, 2^1225521487 is an apocalyptic number.

1225521487 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225521487 is an equidigital number, since it uses as much as digits as its factorization.

1225521487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 44800, while the sum is 37.

The square root of 1225521487 is about 35007.4490216011. The cubic root of 1225521487 is about 1070.1392915586.

The spelling of 1225521487 in words is "one billion, two hundred twenty-five million, five hundred twenty-one thousand, four hundred eighty-seven".