1914409621 has 2 divisors, whose sum is σ = 1914409622. Its totient is φ = 1914409620.

The previous prime is 1914409591. The next prime is 1914409631. The reversal of 1914409621 is 1269044191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1910564100 + 3845521 = 43710^2 + 1961^2 .

It is a cyclic number.

It is not a de Polignac number, because 1914409621 - 2⁵ = 1914409589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1914409631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 957204810 + 957204811.

It is an arithmetic number, because the mean of its divisors is an integer number (957204811).

Almost surely, 2^1914409621 is an apocalyptic number.

It is an amenable number.

1914409621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1914409621 is an equidigital number, since it uses as much as digits as its factorization.

1914409621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 1914409621 is about 43753.9669172979. The cubic root of 1914409621 is about 1241.6855375378.

The spelling of 1914409621 in words is "one billion, nine hundred fourteen million, four hundred nine thousand, six hundred twenty-one".