697971 has 8 divisors (see below), whose sum is σ = 936144. Its totient is φ = 462560.

The previous prime is 697967. The next prime is 697973. The reversal of 697971 is 179796.

697971 is a nontrivial binomial coefficient, being equal to C(1182, 2).

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

It is a 5-Lehmer number, since φ(697971) divides (697971-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 697971 - 2² = 697967 is a prime.

It is not an unprimeable number, because it can be changed into a prime (697973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1 + ... + 1181.

It is an arithmetic number, because the mean of its divisors is an integer number (117018).

2⁶⁹⁷⁹⁷¹ is an apocalyptic number.

697971 is the 1181-st triangular number and also the 591-st hexagonal number.

697971 is a deficient number, since it is larger than the sum of its proper divisors (238173).

697971 is a wasteful number, since it uses less digits than its factorization.

697971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1381.

The product of its digits is 23814, while the sum is 39.

The square root of 697971 is about 835.4465871616. The cubic root of 697971 is about 88.7045287135.

The spelling of 697971 in words is "six hundred ninety-seven thousand, nine hundred seventy-one".