691214320449 has 15 divisors (see below), whose sum is σ = 1032565903347. Its totient is φ = 460804558608.

The previous prime is 691214320409. The next prime is 691214320481. The reversal of 691214320449 is 944023412196.

The square root of 691214320449 is 831393.

It is a perfect power (a square), and thus also a powerful number.

691214320449 is a `hidden beast` number, since 69 + 1 + 2 + 143 + 2 + 0 + 449 = 666.

It can be written as a sum of positive squares in only one way, i.e., 556061033025 + 135153287424 = 745695^2 + 367632^2 .

It is not a de Polignac number, because 691214320449 - 2²³ = 691205931841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (691214320409) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 7436349 + ... + 7528725.

Almost surely, 2^691214320449 is an apocalyptic number.

691214320449 is the 831393-rd square number.

691214320449 is the 415697-th centered octagonal number.

It is an amenable number.

691214320449 is a deficient number, since it is larger than the sum of its proper divisors (341351582898).

691214320449 is an frugal number, since it uses more digits than its factorization.

691214320449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184766 (or 92380 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The spelling of 691214320449 in words is "six hundred ninety-one billion, two hundred fourteen million, three hundred twenty thousand, four hundred forty-nine".