1961393609 has 12 divisors (see below), whose sum is σ = 2380823424. Its totient is φ = 1608098184.

The previous prime is 1961393597. The next prime is 1961393647. The reversal of 1961393609 is 9063931691.

It is not a de Polignac number, because 1961393609 - 2¹⁶ = 1961328073 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1961393689) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 869057 + ... + 871310.

It is an arithmetic number, because the mean of its divisors is an integer number (198401952).

Almost surely, 2^1961393609 is an apocalyptic number.

It is an amenable number.

1961393609 is a deficient number, since it is larger than the sum of its proper divisors (419429815).

1961393609 is a wasteful number, since it uses less digits than its factorization.

1961393609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1740404 (or 1740397 counting only the distinct ones).

The product of its (nonzero) digits is 236196, while the sum is 47.

The square root of 1961393609 is about 44287.6236549219. The cubic root of 1961393609 is about 1251.7614864863.

The spelling of 1961393609 in words is "one billion, nine hundred sixty-one million, three hundred ninety-three thousand, six hundred nine".