6381020977 has 4 divisors (see below), whose sum is σ = 6395758180. Its totient is φ = 6366283776.

The previous prime is 6381020959. The next prime is 6381021113. The reversal of 6381020977 is 7790201836.

It is a happy number.

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 1628848881 + 4752172096 = 40359^2 + 68936^2 .

It is a cyclic number.

It is not a de Polignac number, because 6381020977 - 2²³ = 6372632369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6381020077) 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, 7367952 + ... + 7368817.

It is an arithmetic number, because the mean of its divisors is an integer number (1598939545).

Almost surely, 2^6381020977 is an apocalyptic number.

It is an amenable number.

6381020977 is a deficient number, since it is larger than the sum of its proper divisors (14737203).

6381020977 is a wasteful number, since it uses less digits than its factorization.

6381020977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14737202.

The product of its (nonzero) digits is 127008, while the sum is 43.

The square root of 6381020977 is about 79881.2930353534. The cubic root of 6381020977 is about 1854.7984491968.

The spelling of 6381020977 in words is "six billion, three hundred eighty-one million, twenty thousand, nine hundred seventy-seven".