98451781 has 8 divisors (see below), whose sum is σ = 102087000. Its totient is φ = 94832640.

The previous prime is 98451767. The next prime is 98451791. The reversal of 98451781 is 18715489.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9922500 + 88529281 = 3150^2 + 9409^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 6-Lehmer number, since φ(98451781) divides (98451781-1)⁶.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-98451781 is a prime.

It is a super-2 number, since 2×98451781² = 19385506364143922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (98451761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9241 + ... + 16801.

It is an arithmetic number, because the mean of its divisors is an integer number (12760875).

Almost surely, 2^98451781 is an apocalyptic number.

It is an amenable number.

98451781 is a deficient number, since it is larger than the sum of its proper divisors (3635219).

98451781 is a wasteful number, since it uses less digits than its factorization.

98451781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8039.

The product of its digits is 80640, while the sum is 43.

The square root of 98451781 is about 9922.2870851432. The cubic root of 98451781 is about 461.7510152430.

The spelling of 98451781 in words is "ninety-eight million, four hundred fifty-one thousand, seven hundred eighty-one".