1916251 has 2 divisors, whose sum is σ = 1916252. Its totient is φ = 1916250.

The previous prime is 1916249. The next prime is 1916269. The reversal of 1916251 is 1526191.

It is a weak prime.

It is an emirp because it is prime and its reverse (1526191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1916251 - 2¹ = 1916249 is a prime.

Together with 1916249, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1916231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 958125 + 958126.

It is an arithmetic number, because the mean of its divisors is an integer number (958126).

2^1916251 is an apocalyptic number.

1916251 is the 876-th centered pentagonal number.

1916251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1916251 is an equidigital number, since it uses as much as digits as its factorization.

1916251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 540, while the sum is 25.

The square root of 1916251 is about 1384.2871811875. The cubic root of 1916251 is about 124.2083515932.

The spelling of 1916251 in words is "one million, nine hundred sixteen thousand, two hundred fifty-one".