1263121 has 2 divisors, whose sum is σ = 1263122. Its totient is φ = 1263120.

The previous prime is 1263113. The next prime is 1263133. The reversal of 1263121 is 1213621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1166400 + 96721 = 1080^2 + 311^2 .

It is a cyclic number.

It is not a de Polignac number, because 1263121 - 2³ = 1263113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1263095 and 1263104.

It is not a weakly prime, because it can be changed into another prime (1263181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631560 + 631561.

It is an arithmetic number, because the mean of its divisors is an integer number (631561).

2^1263121 is an apocalyptic number.

It is an amenable number.

1263121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263121 is an equidigital number, since it uses as much as digits as its factorization.

1263121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72, while the sum is 16.

The square root of 1263121 is about 1123.8865601118. The cubic root of 1263121 is about 108.0973345193.

Adding to 1263121 its reverse (1213621), we get a palindrome (2476742).

The spelling of 1263121 in words is "one million, two hundred sixty-three thousand, one hundred twenty-one".