691456441 has 4 divisors (see below), whose sum is σ = 744645412. Its totient is φ = 638267472.

The previous prime is 691456439. The next prime is 691456463. The reversal of 691456441 is 144654196.

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

It can be written as a sum of positive squares in 2 ways, for example, as 463325625 + 228130816 = 21525^2 + 15104^2 .

It is a cyclic number.

It is not a de Polignac number, because 691456441 - 2¹ = 691456439 is a prime.

It is a super-2 number, since 2×691456441² = 956224019600772962, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 691456394 and 691456403.

It is not an unprimeable number, because it can be changed into a prime (691456421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26594466 + ... + 26594491.

It is an arithmetic number, because the mean of its divisors is an integer number (186161353).

Almost surely, 2^691456441 is an apocalyptic number.

It is an amenable number.

691456441 is a deficient number, since it is larger than the sum of its proper divisors (53188971).

691456441 is a wasteful number, since it uses less digits than its factorization.

691456441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53188970.

The product of its digits is 103680, while the sum is 40.

The square root of 691456441 is about 26295.5593399342. The cubic root of 691456441 is about 884.2768906819.

The spelling of 691456441 in words is "six hundred ninety-one million, four hundred fifty-six thousand, four hundred forty-one".