1212649 has 2 divisors, whose sum is σ = 1212650. Its totient is φ = 1212648.

The previous prime is 1212641. The next prime is 1212671. The reversal of 1212649 is 9462121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 937024 + 275625 = 968^2 + 525^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212649 - 2³ = 1212641 is a prime.

It is not a weakly prime, because it can be changed into another prime (1212641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606324 + 606325.

It is an arithmetic number, because the mean of its divisors is an integer number (606325).

2^1212649 is an apocalyptic number.

It is an amenable number.

1212649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212649 is an equidigital number, since it uses as much as digits as its factorization.

1212649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 25.

The square root of 1212649 is about 1101.2034326136. The cubic root of 1212649 is about 106.6379295416.

The spelling of 1212649 in words is "one million, two hundred twelve thousand, six hundred forty-nine".