654400169 has 4 divisors (see below), whose sum is σ = 666747396. Its totient is φ = 642052944.

The previous prime is 654400141. The next prime is 654400171. The reversal of 654400169 is 961004456.

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 303212569 + 351187600 = 17413^2 + 18740^2 .

It is a cyclic number.

It is not a de Polignac number, because 654400169 - 2¹² = 654396073 is a prime.

It is a super-2 number, since 2×654400169² = 856479162374457122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (654400199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6173534 + ... + 6173639.

It is an arithmetic number, because the mean of its divisors is an integer number (166686849).

Almost surely, 2^654400169 is an apocalyptic number.

It is an amenable number.

654400169 is a deficient number, since it is larger than the sum of its proper divisors (12347227).

654400169 is a wasteful number, since it uses less digits than its factorization.

654400169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12347226.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 654400169 is about 25581.2464317124. The cubic root of 654400169 is about 868.1893770326.

The spelling of 654400169 in words is "six hundred fifty-four million, four hundred thousand, one hundred sixty-nine".