1219951 has 2 divisors, whose sum is σ = 1219952. Its totient is φ = 1219950.

The previous prime is 1219949. The next prime is 1219957. The reversal of 1219951 is 1599121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1219951 - 2¹ = 1219949 is a prime.

Together with 1219949, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1219957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609975 + 609976.

It is an arithmetic number, because the mean of its divisors is an integer number (609976).

2^1219951 is an apocalyptic number.

1219951 is a deficient number, since it is larger than the sum of its proper divisors (1).

1219951 is an equidigital number, since it uses as much as digits as its factorization.

1219951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 810, while the sum is 28.

The square root of 1219951 is about 1104.5139202382. The cubic root of 1219951 is about 106.8515424505.

Subtracting from 1219951 its product of digits (810), we obtain a triangular number (1219141 = T₁₅₆₁).

The spelling of 1219951 in words is "one million, two hundred nineteen thousand, nine hundred fifty-one".