989472781 has 6 divisors (see below), whose sum is σ = 1087602446. Its totient is φ = 899520600.

The previous prime is 989472769. The next prime is 989472791. The reversal of 989472781 is 187274989.

It is a happy number.

989472781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 637310025 + 352162756 = 25245^2 + 18766^2 .

It is a de Polignac number, because none of the positive numbers 2^k-989472781 is a prime.

It is a super-2 number, since 2×989472781² = 1958112768679747922, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989472791) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4088610 + ... + 4088851.

Almost surely, 2^989472781 is an apocalyptic number.

989472781 is the 14068-th centered decagonal number.

It is an amenable number.

989472781 is a deficient number, since it is larger than the sum of its proper divisors (98129665).

989472781 is a wasteful number, since it uses less digits than its factorization.

989472781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8177483 (or 8177472 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 55.

The square root of 989472781 is about 31455.8862695045. The cubic root of 989472781 is about 996.4785408818.

The spelling of 989472781 in words is "nine hundred eighty-nine million, four hundred seventy-two thousand, seven hundred eighty-one".