88121575781 has 2 divisors, whose sum is σ = 88121575782. Its totient is φ = 88121575780.

The previous prime is 88121575723. The next prime is 88121575823. The reversal of 88121575781 is 18757512188.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69190567681 + 18931008100 = 263041^2 + 137590^2 .

It is a cyclic number.

It is not a de Polignac number, because 88121575781 - 2³⁴ = 70941706597 is a prime.

It is a super-2 number, since 2×88121575781² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (88121575181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44060787890 + 44060787891.

It is an arithmetic number, because the mean of its divisors is an integer number (44060787891).

Almost surely, 2^88121575781 is an apocalyptic number.

It is an amenable number.

88121575781 is a deficient number, since it is larger than the sum of its proper divisors (1).

88121575781 is an equidigital number, since it uses as much as digits as its factorization.

88121575781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1254400, while the sum is 53.

The spelling of 88121575781 in words is "eighty-eight billion, one hundred twenty-one million, five hundred seventy-five thousand, seven hundred eighty-one".