98908781 has 2 divisors, whose sum is σ = 98908782. Its totient is φ = 98908780.

The previous prime is 98908757. The next prime is 98908841. The reversal of 98908781 is 18780989.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95452900 + 3455881 = 9770^2 + 1859^2 .

It is a cyclic number.

It is not a de Polignac number, because 98908781 - 2²⁶ = 31799917 is a prime.

It is a super-2 number, since 2×98908781² = 19565893917811922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (98908741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49454390 + 49454391.

It is an arithmetic number, because the mean of its divisors is an integer number (49454391).

Almost surely, 2^98908781 is an apocalyptic number.

It is an amenable number.

98908781 is a deficient number, since it is larger than the sum of its proper divisors (1).

98908781 is an equidigital number, since it uses as much as digits as its factorization.

98908781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 50.

The square root of 98908781 is about 9945.2893874437. The cubic root of 98908781 is about 462.4643747578.

The spelling of 98908781 in words is "ninety-eight million, nine hundred eight thousand, seven hundred eighty-one".