1231257 has 8 divisors (see below), whose sum is σ = 1728160. Its totient is φ = 777600.

The previous prime is 1231247. The next prime is 1231261. The reversal of 1231257 is 7521321.

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

It is not a de Polignac number, because 1231257 - 2⁶ = 1231193 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231207) 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, 10744 + ... + 10857.

It is an arithmetic number, because the mean of its divisors is an integer number (216020).

2^1231257 is an apocalyptic number.

It is an amenable number.

1231257 is a deficient number, since it is larger than the sum of its proper divisors (496903).

1231257 is a wasteful number, since it uses less digits than its factorization.

1231257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21623.

The product of its digits is 420, while the sum is 21.

The square root of 1231257 is about 1109.6202052955. The cubic root of 1231257 is about 107.1806132332.

Adding to 1231257 its reverse (7521321), we get a palindrome (8752578).

Subtracting 1231257 from its reverse (7521321), we obtain a square (6290064 = 2508²).

The spelling of 1231257 in words is "one million, two hundred thirty-one thousand, two hundred fifty-seven".