1522125021491 has 2 divisors, whose sum is σ = 1522125021492. Its totient is φ = 1522125021490.

The previous prime is 1522125021407. The next prime is 1522125021511. The reversal of 1522125021491 is 1941205212251.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1522125021491 is a prime.

It is not a weakly prime, because it can be changed into another prime (1522125021091) 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, 761062510745 + 761062510746.

It is an arithmetic number, because the mean of its divisors is an integer number (761062510746).

Almost surely, 2^{1522125021491} is an apocalyptic number.

1522125021491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1522125021491 is an equidigital number, since it uses as much as digits as its factorization.

1522125021491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 35.

The spelling of 1522125021491 in words is "one trillion, five hundred twenty-two billion, one hundred twenty-five million, twenty-one thousand, four hundred ninety-one".