1376523649 has 4 divisors (see below), whose sum is σ = 1389388464. Its totient is φ = 1363658836.

The previous prime is 1376523637. The next prime is 1376523661. The reversal of 1376523649 is 9463256731.

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: 9463256731 = 131 ⋅72238601.

It is an interprime number because it is at equal distance from previous prime (1376523637) and next prime (1376523661).

It is a cyclic number.

It is not a de Polignac number, because 1376523649 - 2¹⁵ = 1376490881 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1376523599 and 1376523608.

It is not an unprimeable number, because it can be changed into a prime (1376523679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6432247 + ... + 6432460.

It is an arithmetic number, because the mean of its divisors is an integer number (347347116).

Almost surely, 2^1376523649 is an apocalyptic number.

It is an amenable number.

1376523649 is a deficient number, since it is larger than the sum of its proper divisors (12864815).

1376523649 is a wasteful number, since it uses less digits than its factorization.

1376523649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12864814.

The product of its digits is 816480, while the sum is 46.

The square root of 1376523649 is about 37101.5316260663. The cubic root of 1376523649 is about 1112.4006288215.

The spelling of 1376523649 in words is "one billion, three hundred seventy-six million, five hundred twenty-three thousand, six hundred forty-nine".