691725407 has 8 divisors (see below), whose sum is σ = 694579200. Its totient is φ = 688877784.

The previous prime is 691725389. The next prime is 691725479. The reversal of 691725407 is 704527196.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 691725407 - 2¹⁴ = 691709023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691725007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 484028 + ... + 485454.

It is an arithmetic number, because the mean of its divisors is an integer number (86822400).

Almost surely, 2^691725407 is an apocalyptic number.

691725407 is a deficient number, since it is larger than the sum of its proper divisors (2853793).

691725407 is a wasteful number, since it uses less digits than its factorization.

691725407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3085.

The product of its (nonzero) digits is 105840, while the sum is 41.

The square root of 691725407 is about 26300.6731282680. The cubic root of 691725407 is about 884.3915325556.

The spelling of 691725407 in words is "six hundred ninety-one million, seven hundred twenty-five thousand, four hundred seven".