1992670991 has 4 divisors (see below), whose sum is σ = 1998381000. Its totient is φ = 1986960984.

The previous prime is 1992670973. The next prime is 1992671003. The reversal of 1992670991 is 1990762991.

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 1992670991 - 2²² = 1988476687 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 (1992670091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2854481 + ... + 2855178.

It is an arithmetic number, because the mean of its divisors is an integer number (499595250).

Almost surely, 2^1992670991 is an apocalyptic number.

1992670991 is a deficient number, since it is larger than the sum of its proper divisors (5710009).

1992670991 is an equidigital number, since it uses as much as digits as its factorization.

1992670991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5710008.

The product of its (nonzero) digits is 551124, while the sum is 53.

The square root of 1992670991 is about 44639.3435323594. The cubic root of 1992670991 is about 1258.3801707208.

The spelling of 1992670991 in words is "one billion, nine hundred ninety-two million, six hundred seventy thousand, nine hundred ninety-one".