45531781641221 has 2 divisors, whose sum is σ = 45531781641222. Its totient is φ = 45531781641220.

The previous prime is 45531781641113. The next prime is 45531781641253. The reversal of 45531781641221 is 12214618713554.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35453855210596 + 10077926430625 = 5954314^2 + 3174575^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-45531781641221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 45531781641221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (45531781611221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22765890820610 + 22765890820611.

It is an arithmetic number, because the mean of its divisors is an integer number (22765890820611).

Almost surely, 2^{45531781641221} is an apocalyptic number.

It is an amenable number.

45531781641221 is a deficient number, since it is larger than the sum of its proper divisors (1).

45531781641221 is an equidigital number, since it uses as much as digits as its factorization.

45531781641221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1612800, while the sum is 50.

The spelling of 45531781641221 in words is "forty-five trillion, five hundred thirty-one billion, seven hundred eighty-one million, six hundred forty-one thousand, two hundred twenty-one".