1967590649 has 4 divisors (see below), whose sum is σ = 1967794164. Its totient is φ = 1967387136.

The previous prime is 1967590643. The next prime is 1967590661. The reversal of 1967590649 is 9460957691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9460957691 = 17 ⋅556526923.

It can be written as a sum of positive squares in 2 ways, for example, as 800890000 + 1166700649 = 28300^2 + 34157^2 .

It is a cyclic number.

It is not a de Polignac number, because 1967590649 - 2²⁰ = 1966542073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1967590594 and 1967590603.

It is not an unprimeable number, because it can be changed into a prime (1967590643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86492 + ... + 106845.

It is an arithmetic number, because the mean of its divisors is an integer number (491948541).

Almost surely, 2^1967590649 is an apocalyptic number.

It is an amenable number.

1967590649 is a deficient number, since it is larger than the sum of its proper divisors (203515).

1967590649 is a wasteful number, since it uses less digits than its factorization.

1967590649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203514.

The product of its (nonzero) digits is 3674160, while the sum is 56.

The square root of 1967590649 is about 44357.5320436113. The cubic root of 1967590649 is about 1253.0784175726.

The spelling of 1967590649 in words is "one billion, nine hundred sixty-seven million, five hundred ninety thousand, six hundred forty-nine".