998150781 has 16 divisors (see below), whose sum is σ = 1376843328. Its totient is φ = 642768000.

The previous prime is 998150771. The next prime is 998150821. The reversal of 998150781 is 187051899.

It is not a de Polignac number, because 998150781 - 2⁶ = 998150717 is a prime.

It is a super-2 number, since 2×998150781² = 1992609963221819922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 998150781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998150771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27751 + ... + 52596.

It is an arithmetic number, because the mean of its divisors is an integer number (86052708).

Almost surely, 2^998150781 is an apocalyptic number.

It is an amenable number.

998150781 is a deficient number, since it is larger than the sum of its proper divisors (378692547).

998150781 is a wasteful number, since it uses less digits than its factorization.

998150781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80492.

The product of its (nonzero) digits is 181440, while the sum is 48.

The square root of 998150781 is about 31593.5243523099. The cubic root of 998150781 is about 999.3832133191.

The spelling of 998150781 in words is "nine hundred ninety-eight million, one hundred fifty thousand, seven hundred eighty-one".