1264649 has 2 divisors, whose sum is σ = 1264650. Its totient is φ = 1264648.

The previous prime is 1264643. The next prime is 1264651. The reversal of 1264649 is 9464621.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 753424 + 511225 = 868^2 + 715^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1264649 is a prime.

Together with 1264651, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (1264643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632324 + 632325.

It is an arithmetic number, because the mean of its divisors is an integer number (632325).

2^1264649 is an apocalyptic number.

It is an amenable number.

1264649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1264649 is an equidigital number, since it uses as much as digits as its factorization.

1264649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 32.

The square root of 1264649 is about 1124.5661385619. The cubic root of 1264649 is about 108.1409054753.

The spelling of 1264649 in words is "one million, two hundred sixty-four thousand, six hundred forty-nine".