1997501 has 8 divisors (see below), whose sum is σ = 2199744. Its totient is φ = 1798720.

The previous prime is 1997473. The next prime is 1997503. The reversal of 1997501 is 1057991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1997501 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 440 + ... + 2046.

It is an arithmetic number, because the mean of its divisors is an integer number (274968).

2^1997501 is an apocalyptic number.

1997501 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1997501 is a deficient number, since it is larger than the sum of its proper divisors (202243).

1997501 is a wasteful number, since it uses less digits than its factorization.

1997501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1731.

The product of its (nonzero) digits is 2835, while the sum is 32.

The square root of 1997501 is about 1413.3297562848. The cubic root of 1997501 is about 125.9396074064.

The spelling of 1997501 in words is "one million, nine hundred ninety-seven thousand, five hundred one".