75731148221 has 2 divisors, whose sum is σ = 75731148222. Its totient is φ = 75731148220.

The previous prime is 75731148203. The next prime is 75731148223. The reversal of 75731148221 is 12284113757.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69566700025 + 6164448196 = 263755^2 + 78514^2 .

It is a cyclic number.

It is not a de Polignac number, because 75731148221 - 2¹⁰ = 75731147197 is a prime.

Together with 75731148223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75731148223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37865574110 + 37865574111.

It is an arithmetic number, because the mean of its divisors is an integer number (37865574111).

Almost surely, 2^75731148221 is an apocalyptic number.

It is an amenable number.

75731148221 is a deficient number, since it is larger than the sum of its proper divisors (1).

75731148221 is an equidigital number, since it uses as much as digits as its factorization.

75731148221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 94080, while the sum is 41.

The spelling of 75731148221 in words is "seventy-five billion, seven hundred thirty-one million, one hundred forty-eight thousand, two hundred twenty-one".