691154 has 4 divisors (see below), whose sum is σ = 1036734. Its totient is φ = 345576.

The previous prime is 691153. The next prime is 691181. The reversal of 691154 is 451196.

691154 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 683929 + 7225 = 827^2 + 85^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (691151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172787 + ... + 172790.

2⁶⁹¹¹⁵⁴ is an apocalyptic number.

691154 is a deficient number, since it is larger than the sum of its proper divisors (345580).

691154 is a wasteful number, since it uses less digits than its factorization.

691154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345579.

The product of its digits is 1080, while the sum is 26.

The square root of 691154 is about 831.3567224724. The cubic root of 691154 is about 88.4147945182.

The spelling of 691154 in words is "six hundred ninety-one thousand, one hundred fifty-four".