1251641 has 2 divisors, whose sum is σ = 1251642. Its totient is φ = 1251640.

The previous prime is 1251583. The next prime is 1251661. The reversal of 1251641 is 1461521.

It is an a-pointer prime, because the next prime (1251661) can be obtained adding 1251641 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 674041 + 577600 = 821^2 + 760^2 .

It is a cyclic number.

It is not a de Polignac number, because 1251641 - 2⁶ = 1251577 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon 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, 625820 + 625821.

It is an arithmetic number, because the mean of its divisors is an integer number (625821).

2^1251641 is an apocalyptic number.

It is an amenable number.

1251641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251641 is an equidigital number, since it uses as much as digits as its factorization.

1251641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 240, while the sum is 20.

The square root of 1251641 is about 1118.7676255595. The cubic root of 1251641 is about 107.7688529196.

The spelling of 1251641 in words is "one million, two hundred fifty-one thousand, six hundred forty-one".