1257121 has 8 divisors (see below), whose sum is σ = 1321920. Its totient is φ = 1193808.

The previous prime is 1257119. The next prime is 1257131. The reversal of 1257121 is 1217521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1257121 - 2¹ = 1257119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1257131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1620 + ... + 2266.

It is an arithmetic number, because the mean of its divisors is an integer number (165240).

2^1257121 is an apocalyptic number.

It is an amenable number.

1257121 is a deficient number, since it is larger than the sum of its proper divisors (64799).

1257121 is an equidigital number, since it uses as much as digits as its factorization.

1257121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743.

The product of its digits is 140, while the sum is 19.

The square root of 1257121 is about 1121.2140741179. The cubic root of 1257121 is about 107.9259036797.

It can be divided in two parts, 1257 and 121, that added together give a triangular number (1378 = T₅₂).

The spelling of 1257121 in words is "one million, two hundred fifty-seven thousand, one hundred twenty-one".