1912991667 has 4 divisors (see below), whose sum is σ = 2550655560. Its totient is φ = 1275327776.

The previous prime is 1912991651. The next prime is 1912991671. The reversal of 1912991667 is 7661992191.

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 1912991667 - 2⁴ = 1912991651 is a prime.

It is a super-2 number, since 2×1912991667² = 7319074236022877778, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1912991677) 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, 318831942 + ... + 318831947.

It is an arithmetic number, because the mean of its divisors is an integer number (637663890).

Almost surely, 2^1912991667 is an apocalyptic number.

1912991667 is a deficient number, since it is larger than the sum of its proper divisors (637663893).

1912991667 is an equidigital number, since it uses as much as digits as its factorization.

1912991667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637663892.

The product of its digits is 367416, while the sum is 51.

The square root of 1912991667 is about 43737.7601964252. The cubic root of 1912991667 is about 1241.3789002984.

The spelling of 1912991667 in words is "one billion, nine hundred twelve million, nine hundred ninety-one thousand, six hundred sixty-seven".