1371775681 has 4 divisors (see below), whose sum is σ = 1372050432. Its totient is φ = 1371500932.

The previous prime is 1371775667. The next prime is 1371775693. The reversal of 1371775681 is 1865771731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1865771731 = 37 ⋅50426263.

It is a cyclic number.

It is not a de Polignac number, because 1371775681 - 2¹⁹ = 1371251393 is a prime.

It is a super-2 number, since 2×1371775681² = 3763537037966027522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1371773681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129745 + ... + 139918.

It is an arithmetic number, because the mean of its divisors is an integer number (343012608).

Almost surely, 2^1371775681 is an apocalyptic number.

It is an amenable number.

1371775681 is a deficient number, since it is larger than the sum of its proper divisors (274751).

1371775681 is an equidigital number, since it uses as much as digits as its factorization.

1371775681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274750.

The product of its digits is 246960, while the sum is 46.

The square root of 1371775681 is about 37037.4902092461. The cubic root of 1371775681 is about 1111.1201745368.

It can be divided in two parts, 13717 and 75681, that added together give a palindrome (89398).

The spelling of 1371775681 in words is "one billion, three hundred seventy-one million, seven hundred seventy-five thousand, six hundred eighty-one".