1916701421 has 2 divisors, whose sum is σ = 1916701422. Its totient is φ = 1916701420.

The previous prime is 1916701403. The next prime is 1916701433. The reversal of 1916701421 is 1241076191.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1063477321 + 853224100 = 32611^2 + 29210^2 .

It is a cyclic number.

It is not a de Polignac number, because 1916701421 - 2¹⁰ = 1916700397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1916701471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 958350710 + 958350711.

It is an arithmetic number, because the mean of its divisors is an integer number (958350711).

Almost surely, 2^1916701421 is an apocalyptic number.

It is an amenable number.

1916701421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1916701421 is an equidigital number, since it uses as much as digits as its factorization.

1916701421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 1916701421 is about 43780.1487092038. The cubic root of 1916701421 is about 1242.1808268917.

The spelling of 1916701421 in words is "one billion, nine hundred sixteen million, seven hundred one thousand, four hundred twenty-one".