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690913 = 1494637
BaseRepresentation
bin10101000101011100001
31022002202101
42220223201
5134102123
622450401
75605216
oct2505341
91262671
10690913
11432103
12293a01
131b2632
1413db0d
15d9aad
hexa8ae1

690913 has 4 divisors (see below), whose sum is σ = 695700. Its totient is φ = 686128.

The previous prime is 690889. The next prime is 690919. The reversal of 690913 is 319096.

It is a happy number.

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 123904 + 567009 = 352^2 + 753^2 .

It is a cyclic number.

It is not a de Polignac number, because 690913 - 217 = 559841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690919) 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, 2170 + ... + 2467.

It is an arithmetic number, because the mean of its divisors is an integer number (173925).

2690913 is an apocalyptic number.

It is an amenable number.

690913 is a deficient number, since it is larger than the sum of its proper divisors (4787).

690913 is a wasteful number, since it uses less digits than its factorization.

690913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4786.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 690913 is about 831.2117660380. The cubic root of 690913 is about 88.4045168075.

The spelling of 690913 in words is "six hundred ninety thousand, nine hundred thirteen".

Divisors: 1 149 4637 690913