1225440581 has 2 divisors, whose sum is σ = 1225440582. Its totient is φ = 1225440580.

The previous prime is 1225440577. The next prime is 1225440647. The reversal of 1225440581 is 1850445221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1182328225 + 43112356 = 34385^2 + 6566^2 .

It is a cyclic number.

It is not a de Polignac number, because 1225440581 - 2² = 1225440577 is a prime.

It is a super-2 number, since 2×1225440581² = 3003409235123235122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1225449581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612720290 + 612720291.

It is an arithmetic number, because the mean of its divisors is an integer number (612720291).

Almost surely, 2^1225440581 is an apocalyptic number.

It is an amenable number.

1225440581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225440581 is an equidigital number, since it uses as much as digits as its factorization.

1225440581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12800, while the sum is 32.

The square root of 1225440581 is about 35006.2934484644. The cubic root of 1225440581 is about 1070.1157416941.

The spelling of 1225440581 in words is "one billion, two hundred twenty-five million, four hundred forty thousand, five hundred eighty-one".