1252921 has 2 divisors, whose sum is σ = 1252922. Its totient is φ = 1252920.

The previous prime is 1252913. The next prime is 1252943. The reversal of 1252921 is 1292521.

It is an a-pointer prime, because the next prime (1252943) can be obtained adding 1252921 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1040400 + 212521 = 1020^2 + 461^2 .

It is a cyclic number.

It is not a de Polignac number, because 1252921 - 2³ = 1252913 is a prime.

It is a super-2 number, since 2×1252921² = 3139622064482, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 1252892 and 1252901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1252991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626460 + 626461.

It is an arithmetic number, because the mean of its divisors is an integer number (626461).

2^1252921 is an apocalyptic number.

It is an amenable number.

1252921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1252921 is an equidigital number, since it uses as much as digits as its factorization.

1252921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360, while the sum is 22.

The square root of 1252921 is about 1119.3395374059. The cubic root of 1252921 is about 107.8055772773.

The spelling of 1252921 in words is "one million, two hundred fifty-two thousand, nine hundred twenty-one".