1961899567 has 4 divisors (see below), whose sum is σ = 1962077200. Its totient is φ = 1961721936.

The previous prime is 1961899531. The next prime is 1961899613. The reversal of 1961899567 is 7659981691.

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

It is a cyclic number.

It is not a de Polignac number, because 1961899567 - 2¹⁹ = 1961375279 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 (1961899267) 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, 71067 + ... + 94732.

It is an arithmetic number, because the mean of its divisors is an integer number (490519300).

Almost surely, 2^1961899567 is an apocalyptic number.

1961899567 is a deficient number, since it is larger than the sum of its proper divisors (177633).

1961899567 is a wasteful number, since it uses less digits than its factorization.

1961899567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177632.

The product of its digits is 7348320, while the sum is 61.

The square root of 1961899567 is about 44293.3354693457. The cubic root of 1961899567 is about 1251.8691113718.

The spelling of 1961899567 in words is "one billion, nine hundred sixty-one million, eight hundred ninety-nine thousand, five hundred sixty-seven".