697143491 has 4 divisors (see below), whose sum is σ = 760520184. Its totient is φ = 633766800.

The previous prime is 697143487. The next prime is 697143539. The reversal of 697143491 is 194341796.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 697143491 - 2² = 697143487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (697143481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31688330 + ... + 31688351.

It is an arithmetic number, because the mean of its divisors is an integer number (190130046).

Almost surely, 2^697143491 is an apocalyptic number.

697143491 is a deficient number, since it is larger than the sum of its proper divisors (63376693).

697143491 is a wasteful number, since it uses less digits than its factorization.

697143491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63376692.

The product of its digits is 163296, while the sum is 44.

The square root of 697143491 is about 26403.4749796310. The cubic root of 697143491 is about 886.6945905019.

The spelling of 697143491 in words is "six hundred ninety-seven million, one hundred forty-three thousand, four hundred ninety-one".