100384521040781 has 2 divisors, whose sum is σ = 100384521040782. Its totient is φ = 100384521040780.

The previous prime is 100384521040723. The next prime is 100384521040789. The reversal of 100384521040781 is 187040125483001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66148389183556 + 34236131857225 = 8133166^2 + 5851165^2 .

It is a cyclic number.

It is not a de Polignac number, because 100384521040781 - 2¹⁴ = 100384521024397 is a prime.

It is a super-2 number, since 2×100384521040781² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100384521040789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50192260520390 + 50192260520391.

It is an arithmetic number, because the mean of its divisors is an integer number (50192260520391).

Almost surely, 2^{100384521040781} is an apocalyptic number.

It is an amenable number.

100384521040781 is a deficient number, since it is larger than the sum of its proper divisors (1).

100384521040781 is an equidigital number, since it uses as much as digits as its factorization.

100384521040781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 215040, while the sum is 44.

The spelling of 100384521040781 in words is "one hundred trillion, three hundred eighty-four billion, five hundred twenty-one million, forty thousand, seven hundred eighty-one".