98199781 has 4 divisors (see below), whose sum is σ = 98236512. Its totient is φ = 98163052.

The previous prime is 98199767. The next prime is 98199799. The reversal of 98199781 is 18799189.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 98199781 - 2⁵ = 98199749 is a prime.

It is a super-2 number, since 2×98199781² = 19286393976895922, 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 (98199721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14011 + ... + 19816.

It is an arithmetic number, because the mean of its divisors is an integer number (24559128).

Almost surely, 2^98199781 is an apocalyptic number.

It is an amenable number.

98199781 is a deficient number, since it is larger than the sum of its proper divisors (36731).

98199781 is a wasteful number, since it uses less digits than its factorization.

98199781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36730.

The product of its digits is 326592, while the sum is 52.

The square root of 98199781 is about 9909.5802635631. The cubic root of 98199781 is about 461.3567082478.

It can be divided in two parts, 9819 and 9781, that added together give a square (19600 = 140²).

The spelling of 98199781 in words is "ninety-eight million, one hundred ninety-nine thousand, seven hundred eighty-one".