45531781611221 has 2 divisors, whose sum is σ = 45531781611222. Its totient is φ = 45531781611220.

The previous prime is 45531781611191. The next prime is 45531781611241. The reversal of 45531781611221 is 12211618713554.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41940324538225 + 3591457072996 = 6476135^2 + 1895114^2 .

It is a cyclic number.

It is not a de Polignac number, because 45531781611221 - 2¹⁸ = 45531781349077 is a prime.

It is a super-2 number, since 2×45531781611221² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (45531781611241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22765890805610 + 22765890805611.

It is an arithmetic number, because the mean of its divisors is an integer number (22765890805611).

Almost surely, 2^{45531781611221} is an apocalyptic number.

It is an amenable number.

45531781611221 is a deficient number, since it is larger than the sum of its proper divisors (1).

45531781611221 is an equidigital number, since it uses as much as digits as its factorization.

45531781611221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 403200, while the sum is 47.

The spelling of 45531781611221 in words is "forty-five trillion, five hundred thirty-one billion, seven hundred eighty-one million, six hundred eleven thousand, two hundred twenty-one".