1377435481 has 2 divisors, whose sum is σ = 1377435482. Its totient is φ = 1377435480.

The previous prime is 1377435473. The next prime is 1377435491. The reversal of 1377435481 is 1845347731.

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., 762643456 + 614792025 = 27616^2 + 24795^2 .

It is a cyclic number.

It is not a de Polignac number, because 1377435481 - 2³ = 1377435473 is a prime.

It is a super-2 number, since 2×1377435481² = 3794657008635402722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1377435491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 688717740 + 688717741.

It is an arithmetic number, because the mean of its divisors is an integer number (688717741).

Almost surely, 2^1377435481 is an apocalyptic number.

It is an amenable number.

1377435481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1377435481 is an equidigital number, since it uses as much as digits as its factorization.

1377435481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 282240, while the sum is 43.

The square root of 1377435481 is about 37113.8179254035. The cubic root of 1377435481 is about 1112.6461987893.

The spelling of 1377435481 in words is "one billion, three hundred seventy-seven million, four hundred thirty-five thousand, four hundred eighty-one".