98540581 has 2 divisors, whose sum is σ = 98540582. Its totient is φ = 98540580.

The previous prime is 98540573. The next prime is 98540591. The reversal of 98540581 is 18504589.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81450625 + 17089956 = 9025^2 + 4134^2 .

It is an emirp because it is prime and its reverse (18504589) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 98540581 - 2³ = 98540573 is a prime.

It is a super-2 number, since 2×98540581² = 19420492207635122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (98540501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49270290 + 49270291.

It is an arithmetic number, because the mean of its divisors is an integer number (49270291).

Almost surely, 2^98540581 is an apocalyptic number.

It is an amenable number.

98540581 is a deficient number, since it is larger than the sum of its proper divisors (1).

98540581 is an equidigital number, since it uses as much as digits as its factorization.

98540581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 57600, while the sum is 40.

The square root of 98540581 is about 9926.7608513553. The cubic root of 98540581 is about 461.8898011814.

The spelling of 98540581 in words is "ninety-eight million, five hundred forty thousand, five hundred eighty-one".