981777001 has 4 divisors (see below), whose sum is σ = 981856512. Its totient is φ = 981697492.

The previous prime is 981776993. The next prime is 981777053. The reversal of 981777001 is 100777189.

981777001 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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 100777189 = 83 ⋅1214183.

It is a cyclic number.

It is not a de Polignac number, because 981777001 - 2³ = 981776993 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (981777301) 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, 16825 + ... + 47398.

It is an arithmetic number, because the mean of its divisors is an integer number (245464128).

Almost surely, 2^981777001 is an apocalyptic number.

It is an amenable number.

981777001 is a deficient number, since it is larger than the sum of its proper divisors (79511).

981777001 is a wasteful number, since it uses less digits than its factorization.

981777001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79510.

The product of its (nonzero) digits is 24696, while the sum is 40.

The square root of 981777001 is about 31333.3209379408. The cubic root of 981777001 is about 993.8883913326. Note that the first 3 decimals are identical.

The spelling of 981777001 in words is "nine hundred eighty-one million, seven hundred seventy-seven thousand, one".