697139811 has 64 divisors (see below), whose sum is σ = 1142784000. Its totient is φ = 418309920.

The previous prime is 697139809. The next prime is 697139813. The reversal of 697139811 is 118931796.

It is an interprime number because it is at equal distance from previous prime (697139809) and next prime (697139813).

It is not a de Polignac number, because 697139811 - 2¹ = 697139809 is a prime.

It is a super-2 number, since 2×697139811² = 972007832162231442, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (697139813) 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 63 ways as a sum of consecutive naturals, for example, 937906 + ... + 938648.

It is an arithmetic number, because the mean of its divisors is an integer number (17856000).

Almost surely, 2^697139811 is an apocalyptic number.

697139811 is a deficient number, since it is larger than the sum of its proper divisors (445644189).

697139811 is a wasteful number, since it uses less digits than its factorization.

697139811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861 (or 855 counting only the distinct ones).

The product of its digits is 81648, while the sum is 45.

The square root of 697139811 is about 26403.4052917422. The cubic root of 697139811 is about 886.6930303057.

It can be divided in two parts, 69713 and 9811, that added together give a square (79524 = 282²).

The spelling of 697139811 in words is "six hundred ninety-seven million, one hundred thirty-nine thousand, eight hundred eleven".