1261331023 has 2 divisors, whose sum is σ = 1261331024. Its totient is φ = 1261331022.

The previous prime is 1261331003. The next prime is 1261331111. The reversal of 1261331023 is 3201331621.

It is a weak prime.

It is an emirp because it is prime and its reverse (3201331621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1261331023 - 2¹³ = 1261322831 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1261330985 and 1261331003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1261331003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630665511 + 630665512.

It is an arithmetic number, because the mean of its divisors is an integer number (630665512).

Almost surely, 2^1261331023 is an apocalyptic number.

1261331023 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261331023 is an equidigital number, since it uses as much as digits as its factorization.

1261331023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 1261331023 is about 35515.2224123685. Note that the first 3 decimals coincide. The cubic root of 1261331023 is about 1080.4624856789.

Adding to 1261331023 its reverse (3201331621), we get a palindrome (4462662644).

The spelling of 1261331023 in words is "one billion, two hundred sixty-one million, three hundred thirty-one thousand, twenty-three".