1216951 has 2 divisors, whose sum is σ = 1216952. Its totient is φ = 1216950.

The previous prime is 1216939. The next prime is 1216961. The reversal of 1216951 is 1596121.

It is a strong prime.

It is an emirp because it is prime and its reverse (1596121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1216951 - 2⁷ = 1216823 is a prime.

1216951 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608475 + 608476.

It is an arithmetic number, because the mean of its divisors is an integer number (608476).

2^1216951 is an apocalyptic number.

1216951 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216951 is an equidigital number, since it uses as much as digits as its factorization.

1216951 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1216951 is about 1103.1550208380. The cubic root of 1216951 is about 106.7638838076.

The spelling of 1216951 in words is "one million, two hundred sixteen thousand, nine hundred fifty-one".