1267521481 has 2 divisors, whose sum is σ = 1267521482. Its totient is φ = 1267521480.

The previous prime is 1267521457. The next prime is 1267521499. The reversal of 1267521481 is 1841257621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1265936400 + 1585081 = 35580^2 + 1259^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1267521481 is a prime.

It is a super-2 number, since 2×1267521481² = 3213221409592866722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1267521481.

It is not a weakly prime, because it can be changed into another prime (1267521781) 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, 633760740 + 633760741.

It is an arithmetic number, because the mean of its divisors is an integer number (633760741).

Almost surely, 2^1267521481 is an apocalyptic number.

It is an amenable number.

1267521481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1267521481 is an equidigital number, since it uses as much as digits as its factorization.

1267521481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26880, while the sum is 37.

The square root of 1267521481 is about 35602.2679193335. The cubic root of 1267521481 is about 1082.2271942942.

The spelling of 1267521481 in words is "one billion, two hundred sixty-seven million, five hundred twenty-one thousand, four hundred eighty-one".