1927134821 has 2 divisors, whose sum is σ = 1927134822. Its totient is φ = 1927134820.

The previous prime is 1927134817. The next prime is 1927134829. The reversal of 1927134821 is 1284317291.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1198890625 + 728244196 = 34625^2 + 26986^2 .

It is an emirp because it is prime and its reverse (1284317291) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1927134821 - 2² = 1927134817 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1927134829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 963567410 + 963567411.

It is an arithmetic number, because the mean of its divisors is an integer number (963567411).

Almost surely, 2^1927134821 is an apocalyptic number.

It is an amenable number.

1927134821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1927134821 is an equidigital number, since it uses as much as digits as its factorization.

1927134821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 38.

The square root of 1927134821 is about 43899.1437388020. The cubic root of 1927134821 is about 1244.4306512162.

The spelling of 1927134821 in words is "one billion, nine hundred twenty-seven million, one hundred thirty-four thousand, eight hundred twenty-one".