690161 has 8 divisors (see below), whose sum is σ = 740544. Its totient is φ = 641520.

The previous prime is 690143. The next prime is 690163. The reversal of 690161 is 161096.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690161 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 690161.

It is not an unprimeable number, because it can be changed into a prime (690163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 446 + ... + 1256.

It is an arithmetic number, because the mean of its divisors is an integer number (92568).

2⁶⁹⁰¹⁶¹ is an apocalyptic number.

It is an amenable number.

690161 is a deficient number, since it is larger than the sum of its proper divisors (50383).

690161 is a wasteful number, since it uses less digits than its factorization.

690161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 690161 is about 830.7592912511. The cubic root of 690161 is about 88.3724315664.

The spelling of 690161 in words is "six hundred ninety thousand, one hundred sixty-one".