1001999977 has 4 divisors (see below), whose sum is σ = 1093090896. Its totient is φ = 910909060.

The previous prime is 1001999959. The next prime is 1001999981. The reversal of 1001999977 is 7799991001.

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 a cyclic number.

It is not a de Polignac number, because 1001999977 - 2¹¹ = 1001997929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001999377) 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, 45545443 + ... + 45545464.

It is an arithmetic number, because the mean of its divisors is an integer number (273272724).

Almost surely, 2^1001999977 is an apocalyptic number.

It is an amenable number.

1001999977 is a deficient number, since it is larger than the sum of its proper divisors (91090919).

1001999977 is an equidigital number, since it uses as much as digits as its factorization.

1001999977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91090918.

The product of its (nonzero) digits is 321489, while the sum is 52.

The square root of 1001999977 is about 31654.3832193900. The cubic root of 1001999977 is about 1000.6662150589. Note that the first 3 decimals are identical.

The spelling of 1001999977 in words is "one billion, one million, nine hundred ninety-nine thousand, nine hundred seventy-seven".