691874 has 4 divisors (see below), whose sum is σ = 1037814. Its totient is φ = 345936.

The previous prime is 691871. The next prime is 691877. The reversal of 691874 is 478196.

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

It is an interprime number because it is at equal distance from previous prime (691871) and next prime (691877).

It can be written as a sum of positive squares in only one way, i.e., 483025 + 208849 = 695^2 + 457^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (691871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172967 + ... + 172970.

2⁶⁹¹⁸⁷⁴ is an apocalyptic number.

691874 is a deficient number, since it is larger than the sum of its proper divisors (345940).

691874 is a wasteful number, since it uses less digits than its factorization.

691874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345939.

The product of its digits is 12096, while the sum is 35.

The square root of 691874 is about 831.7896368674. The cubic root of 691874 is about 88.4454854880.

The spelling of 691874 in words is "six hundred ninety-one thousand, eight hundred seventy-four".