997923579001 has 4 divisors (see below), whose sum is σ = 997926076404. Its totient is φ = 997921081600.

The previous prime is 997923578963. The next prime is 997923579041. The reversal of 997923579001 is 100975329799.

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 146777103225 + 851146475776 = 383115^2 + 922576^2 .

It is a 3-Lehmer number, since φ(997923579001) divides (997923579001-1)³.

It is a cyclic number.

It is not a de Polignac number, because 997923579001 - 2³⁵ = 963563840633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997923579041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 499480 + ... + 1498441.

It is an arithmetic number, because the mean of its divisors is an integer number (249481519101).

Almost surely, 2^997923579001 is an apocalyptic number.

997923579001 is the 499481-st decagonal number.

It is an amenable number.

997923579001 is a deficient number, since it is larger than the sum of its proper divisors (2497403).

997923579001 is a wasteful number, since it uses less digits than its factorization.

997923579001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2497402.

The product of its (nonzero) digits is 9644670, while the sum is 61.

The spelling of 997923579001 in words is "nine hundred ninety-seven billion, nine hundred twenty-three million, five hundred seventy-nine thousand, one".