1251667 has 2 divisors, whose sum is σ = 1251668. Its totient is φ = 1251666.

The previous prime is 1251661. The next prime is 1251671. The reversal of 1251667 is 7661521.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1251667 is a prime.

1251667 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1251661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625833 + 625834.

It is an arithmetic number, because the mean of its divisors is an integer number (625834).

2^1251667 is an apocalyptic number.

1251667 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251667 is an equidigital number, since it uses as much as digits as its factorization.

1251667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 28.

The square root of 1251667 is about 1118.7792454278. The cubic root of 1251667 is about 107.7695991322.

The spelling of 1251667 in words is "one million, two hundred fifty-one thousand, six hundred sixty-seven".