1223545456541 has 2 divisors, whose sum is σ = 1223545456542. Its totient is φ = 1223545456540.

The previous prime is 1223545456537. The next prime is 1223545456547. The reversal of 1223545456541 is 1456545453221.

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., 752920644100 + 470624812441 = 867710^2 + 686021^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223545456541 - 2² = 1223545456537 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1223545456547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611772728270 + 611772728271.

It is an arithmetic number, because the mean of its divisors is an integer number (611772728271).

Almost surely, 2^{1223545456541} is an apocalyptic number.

It is an amenable number.

1223545456541 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223545456541 is an equidigital number, since it uses as much as digits as its factorization.

1223545456541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880000, while the sum is 47.

The spelling of 1223545456541 in words is "one trillion, two hundred twenty-three billion, five hundred forty-five million, four hundred fifty-six thousand, five hundred forty-one".