98913781 has 4 divisors (see below), whose sum is σ = 98939232. Its totient is φ = 98888332.

The previous prime is 98913761. The next prime is 98913797. The reversal of 98913781 is 18731989.

98913781 = T₈₁₁₉ + T₈₁₂₀ + T₈₁₂₁.

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 a de Polignac number, because none of the positive numbers 2^k-98913781 is a prime.

It is a super-2 number, since 2×98913781² = 19567872143431922, 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 (98913761) 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 in 3 ways as a sum of consecutive naturals, for example, 5545 + ... + 15118.

It is an arithmetic number, because the mean of its divisors is an integer number (24734808).

Almost surely, 2^98913781 is an apocalyptic number.

98913781 is the 8121-st centered triangular number.

It is an amenable number.

98913781 is a deficient number, since it is larger than the sum of its proper divisors (25451).

98913781 is a wasteful number, since it uses less digits than its factorization.

98913781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25450.

The product of its digits is 108864, while the sum is 46.

The square root of 98913781 is about 9945.5407595565. The cubic root of 98913781 is about 462.4721674023.

The spelling of 98913781 in words is "ninety-eight million, nine hundred thirteen thousand, seven hundred eighty-one".