691451 has 2 divisors, whose sum is σ = 691452. Its totient is φ = 691450.

The previous prime is 691433. The next prime is 691463. The reversal of 691451 is 154196.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 691451 - 2¹⁰ = 690427 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 691451.

It is not a weakly prime, because it can be changed into another prime (691051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345725 + 345726.

It is an arithmetic number, because the mean of its divisors is an integer number (345726).

2⁶⁹¹⁴⁵¹ is an apocalyptic number.

691451 is a deficient number, since it is larger than the sum of its proper divisors (1).

691451 is an equidigital number, since it uses as much as digits as its factorization.

691451 is an evil number, because the sum of its binary digits is even.

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

The square root of 691451 is about 831.5353269705. The cubic root of 691451 is about 88.4274571248.

The spelling of 691451 in words is "six hundred ninety-one thousand, four hundred fifty-one".