997977001 has 4 divisors (see below), whose sum is σ = 1140545152. Its totient is φ = 855408852.

The previous prime is 997976999. The next prime is 997977007. The reversal of 997977001 is 100779799.

It is a happy number.

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 997977001 - 2¹ = 997976999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997977007) 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, 71284065 + ... + 71284078.

It is an arithmetic number, because the mean of its divisors is an integer number (285136288).

Almost surely, 2^997977001 is an apocalyptic number.

It is an amenable number.

997977001 is a deficient number, since it is larger than the sum of its proper divisors (142568151).

997977001 is a wasteful number, since it uses less digits than its factorization.

997977001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142568150.

The product of its (nonzero) digits is 250047, while the sum is 49.

The square root of 997977001 is about 31590.7739854534. The cubic root of 997977001 is about 999.3252117633.

The spelling of 997977001 in words is "nine hundred ninety-seven million, nine hundred seventy-seven thousand, one".