1213951 has 2 divisors, whose sum is σ = 1213952. Its totient is φ = 1213950.

The previous prime is 1213943. The next prime is 1213981. The reversal of 1213951 is 1593121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1213951 - 2³ = 1213943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213921) 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, 606975 + 606976.

It is an arithmetic number, because the mean of its divisors is an integer number (606976).

2^1213951 is an apocalyptic number.

1213951 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213951 is an equidigital number, since it uses as much as digits as its factorization.

1213951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 270, while the sum is 22.

The square root of 1213951 is about 1101.7944454389. The cubic root of 1213951 is about 106.6760809833.

The spelling of 1213951 in words is "one million, two hundred thirteen thousand, nine hundred fifty-one".