90820061 has 2 divisors, whose sum is σ = 90820062. Its totient is φ = 90820060.

The previous prime is 90820013. The next prime is 90820087. The reversal of 90820061 is 16002809.

It is an a-pointer prime, because the next prime (90820087) can be obtained adding 90820061 to its sum of digits (26).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88717561 + 2102500 = 9419^2 + 1450^2 .

It is a cyclic number.

It is not a de Polignac number, because 90820061 - 2⁶ = 90819997 is a prime.

It is a Chen prime.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 90820061.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90820091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45410030 + 45410031.

It is an arithmetic number, because the mean of its divisors is an integer number (45410031).

Almost surely, 2^90820061 is an apocalyptic number.

It is an amenable number.

90820061 is a deficient number, since it is larger than the sum of its proper divisors (1).

90820061 is an equidigital number, since it uses as much as digits as its factorization.

90820061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 90820061 is about 9529.9559810106. The cubic root of 90820061 is about 449.4974818417.

The spelling of 90820061 in words is "ninety million, eight hundred twenty thousand, sixty-one".