1225445035861 has 2 divisors, whose sum is σ = 1225445035862. Its totient is φ = 1225445035860.

The previous prime is 1225445035849. The next prime is 1225445035891. The reversal of 1225445035861 is 1685305445221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 851133559761 + 374311476100 = 922569^2 + 611810^2 .

It is a cyclic number.

It is not a de Polignac number, because 1225445035861 - 2¹³ = 1225445027669 is a prime.

It is a super-2 number, since 2×1225445035861² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1225445035891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612722517930 + 612722517931.

It is an arithmetic number, because the mean of its divisors is an integer number (612722517931).

Almost surely, 2^{1225445035861} is an apocalyptic number.

It is an amenable number.

1225445035861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225445035861 is an equidigital number, since it uses as much as digits as its factorization.

1225445035861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152000, while the sum is 46.

The spelling of 1225445035861 in words is "one trillion, two hundred twenty-five billion, four hundred forty-five million, thirty-five thousand, eight hundred sixty-one".