1381000961 has 4 divisors (see below), whose sum is σ = 1381805124. Its totient is φ = 1380196800.

The previous prime is 1381000939. The next prime is 1381000969. The reversal of 1381000961 is 1690001831.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 773674225 + 607326736 = 27815^2 + 24644^2 .

It is a cyclic number.

It is not a de Polignac number, because 1381000961 - 2¹⁰ = 1380999937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1381000969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 399500 + ... + 402941.

It is an arithmetic number, because the mean of its divisors is an integer number (345451281).

Almost surely, 2^1381000961 is an apocalyptic number.

It is an amenable number.

1381000961 is a deficient number, since it is larger than the sum of its proper divisors (804163).

1381000961 is an equidigital number, since it uses as much as digits as its factorization.

1381000961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804162.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 1381000961 is about 37161.8212820631. The cubic root of 1381000961 is about 1113.6053967063.

The spelling of 1381000961 in words is "one billion, three hundred eighty-one million, nine hundred sixty-one", and thus it is an aban number.