691433 has 2 divisors, whose sum is σ = 691434. Its totient is φ = 691432.

The previous prime is 691409. The next prime is 691451. The reversal of 691433 is 334196.

691433 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 473344 + 218089 = 688^2 + 467^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-691433 is a prime.

It is equal to p₅₅₉₀₇ and since 691433 and 55907 have the same sum of digits, it is a Honaker prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 691433.

It is not a weakly prime, because it can be changed into another prime (691463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345716 + 345717.

It is an arithmetic number, because the mean of its divisors is an integer number (345717).

2⁶⁹¹⁴³³ is an apocalyptic number.

It is an amenable number.

691433 is a deficient number, since it is larger than the sum of its proper divisors (1).

691433 is an equidigital number, since it uses as much as digits as its factorization.

691433 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 26.

The square root of 691433 is about 831.5245035476. The cubic root of 691433 is about 88.4266897973.

The spelling of 691433 in words is "six hundred ninety-one thousand, four hundred thirty-three".