1927440091 has 2 divisors, whose sum is σ = 1927440092. Its totient is φ = 1927440090.

The previous prime is 1927440083. The next prime is 1927440103. The reversal of 1927440091 is 1900447291.

It is a weak prime.

It is an emirp because it is prime and its reverse (1900447291) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1927440091 - 2³ = 1927440083 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1927440091.

It is not a weakly prime, because it can be changed into another prime (1927440491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 963720045 + 963720046.

It is an arithmetic number, because the mean of its divisors is an integer number (963720046).

Almost surely, 2^1927440091 is an apocalyptic number.

1927440091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1927440091 is an equidigital number, since it uses as much as digits as its factorization.

1927440091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 1927440091 is about 43902.6205482087. The cubic root of 1927440091 is about 1244.4963562348.

The spelling of 1927440091 in words is "one billion, nine hundred twenty-seven million, four hundred forty thousand, ninety-one".