1531217 has 2 divisors, whose sum is σ = 1531218. Its totient is φ = 1531216.

The previous prime is 1531199. The next prime is 1531253. The reversal of 1531217 is 7121351.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1256641 + 274576 = 1121^2 + 524^2 .

It is a cyclic number.

It is not a de Polignac number, because 1531217 - 2¹² = 1527121 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1531297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 765608 + 765609.

It is an arithmetic number, because the mean of its divisors is an integer number (765609).

2^1531217 is an apocalyptic number.

It is an amenable number.

1531217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1531217 is an equidigital number, since it uses as much as digits as its factorization.

1531217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 210, while the sum is 20.

The square root of 1531217 is about 1237.4235329910. The cubic root of 1531217 is about 115.2600792988.

Adding to 1531217 its reverse (7121351), we get a palindrome (8652568).

The spelling of 1531217 in words is "one million, five hundred thirty-one thousand, two hundred seventeen".