1225191921461 has 2 divisors, whose sum is σ = 1225191921462. Its totient is φ = 1225191921460.

The previous prime is 1225191921361. The next prime is 1225191921509. The reversal of 1225191921461 is 1641291915221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1192933606225 + 32258315236 = 1092215^2 + 179606^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1225191921461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1225191921361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612595960730 + 612595960731.

It is an arithmetic number, because the mean of its divisors is an integer number (612595960731).

Almost surely, 2^{1225191921461} is an apocalyptic number.

It is an amenable number.

1225191921461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225191921461 is an equidigital number, since it uses as much as digits as its factorization.

1225191921461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 44.

The spelling of 1225191921461 in words is "one trillion, two hundred twenty-five billion, one hundred ninety-one million, nine hundred twenty-one thousand, four hundred sixty-one".