1920995691 has 8 divisors (see below), whose sum is σ = 2604740160. Its totient is φ = 1258957512.

The previous prime is 1920995683. The next prime is 1920995737. The reversal of 1920995691 is 1965990291.

It is a happy number.

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

It is not a de Polignac number, because 1920995691 - 2³ = 1920995683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1920995611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5426365 + ... + 5426718.

It is an arithmetic number, because the mean of its divisors is an integer number (325592520).

Almost surely, 2^1920995691 is an apocalyptic number.

1920995691 is a deficient number, since it is larger than the sum of its proper divisors (683744469).

1920995691 is a wasteful number, since it uses less digits than its factorization.

1920995691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10853145.

The product of its (nonzero) digits is 393660, while the sum is 51.

The square root of 1920995691 is about 43829.1648448838. The cubic root of 1920995691 is about 1243.1078154915.

The spelling of 1920995691 in words is "one billion, nine hundred twenty million, nine hundred ninety-five thousand, six hundred ninety-one".