1225531061 has 2 divisors, whose sum is σ = 1225531062. Its totient is φ = 1225531060.

The previous prime is 1225531009. The next prime is 1225531079. The reversal of 1225531061 is 1601355221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1218428836 + 7102225 = 34906^2 + 2665^2 .

It is an emirp because it is prime and its reverse (1601355221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1225531061 - 2¹⁴ = 1225514677 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1225531061.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1225531001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612765530 + 612765531.

It is an arithmetic number, because the mean of its divisors is an integer number (612765531).

Almost surely, 2^1225531061 is an apocalyptic number.

It is an amenable number.

1225531061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225531061 is an equidigital number, since it uses as much as digits as its factorization.

1225531061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 1225531061 is about 35007.5857636599. The cubic root of 1225531061 is about 1070.1420782599.

Adding to 1225531061 its reverse (1601355221), we get a palindrome (2826886282).

The spelling of 1225531061 in words is "one billion, two hundred twenty-five million, five hundred thirty-one thousand, sixty-one".