981785477 has 4 divisors (see below), whose sum is σ = 984376320. Its totient is φ = 979194636.

The previous prime is 981785447. The next prime is 981785507. The reversal of 981785477 is 774587189.

981785477 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (981785447) and next prime (981785507).

It is a cyclic number.

It is not a de Polignac number, because 981785477 - 2¹⁶ = 981719941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981785447) 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, 1294853 + ... + 1295610.

It is an arithmetic number, because the mean of its divisors is an integer number (246094080).

Almost surely, 2^981785477 is an apocalyptic number.

It is an amenable number.

981785477 is a deficient number, since it is larger than the sum of its proper divisors (2590843).

981785477 is a wasteful number, since it uses less digits than its factorization.

981785477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2590842.

The product of its digits is 3951360, while the sum is 56.

The square root of 981785477 is about 31333.4561930215. The cubic root of 981785477 is about 993.8912515116.

The spelling of 981785477 in words is "nine hundred eighty-one million, seven hundred eighty-five thousand, four hundred seventy-seven".