1376561 has 8 divisors (see below), whose sum is σ = 1416360. Its totient is φ = 1337472.

The previous prime is 1376539. The next prime is 1376567. The reversal of 1376561 is 1656731.

1376561 is nontrivially palindromic in base 9.

It can be written as a sum of positive squares in 4 ways, for example, as 664225 + 712336 = 815^2 + 844^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1376561 - 2⁶ = 1376497 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1376567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7871 + ... + 8043.

It is an arithmetic number, because the mean of its divisors is an integer number (177045).

2^1376561 is an apocalyptic number.

It is an amenable number.

1376561 is a deficient number, since it is larger than the sum of its proper divisors (39799).

1376561 is a wasteful number, since it uses less digits than its factorization.

1376561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355.

The product of its digits is 3780, while the sum is 29.

The square root of 1376561 is about 1173.2693637865. The cubic root of 1376561 is about 111.2410690133.

The spelling of 1376561 in words is "one million, three hundred seventy-six thousand, five hundred sixty-one".