1387627481 has 2 divisors, whose sum is σ = 1387627482. Its totient is φ = 1387627480.

The previous prime is 1387627471. The next prime is 1387627531. The reversal of 1387627481 is 1847267831.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1336633600 + 50993881 = 36560^2 + 7141^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1387627481 is a prime.

It is a super-2 number, since 2×1387627481² = 3851020052052810722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1387627441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 693813740 + 693813741.

It is an arithmetic number, because the mean of its divisors is an integer number (693813741).

Almost surely, 2^1387627481 is an apocalyptic number.

It is an amenable number.

1387627481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1387627481 is an equidigital number, since it uses as much as digits as its factorization.

1387627481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 451584, while the sum is 47.

The square root of 1387627481 is about 37250.8722179763. The cubic root of 1387627481 is about 1115.3837099608.

The spelling of 1387627481 in words is "one billion, three hundred eighty-seven million, six hundred twenty-seven thousand, four hundred eighty-one".