619898981 has 4 divisors (see below), whose sum is σ = 667583532. Its totient is φ = 572214432.

The previous prime is 619898953. The next prime is 619898987. The reversal of 619898981 is 189898916.

619898981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 417548356 + 202350625 = 20434^2 + 14225^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-619898981 is a prime.

It is a super-2 number, since 2×619898981² = 768549493289676722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 619898981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (619898987) 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, 23842256 + ... + 23842281.

It is an arithmetic number, because the mean of its divisors is an integer number (166895883).

Almost surely, 2^619898981 is an apocalyptic number.

It is an amenable number.

619898981 is a deficient number, since it is larger than the sum of its proper divisors (47684551).

619898981 is a wasteful number, since it uses less digits than its factorization.

619898981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47684550.

The product of its digits is 2239488, while the sum is 59.

The square root of 619898981 is about 24897.7706030078. The cubic root of 619898981 is about 852.6555844723.

The spelling of 619898981 in words is "six hundred nineteen million, eight hundred ninety-eight thousand, nine hundred eighty-one".