690061 has 4 divisors (see below), whose sum is σ = 726400. Its totient is φ = 653724.

The previous prime is 690059. The next prime is 690073. The reversal of 690061 is 160096.

690061 = 14² + 15² + ... + 127².

690061 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 690061 - 2¹ = 690059 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690661) 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, 18141 + ... + 18178.

It is an arithmetic number, because the mean of its divisors is an integer number (181600).

2⁶⁹⁰⁰⁶¹ is an apocalyptic number.

690061 is the 372-nd centered decagonal number.

It is an amenable number.

690061 is a deficient number, since it is larger than the sum of its proper divisors (36339).

690061 is a wasteful number, since it uses less digits than its factorization.

690061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36338.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 690061 is about 830.6991031655. The cubic root of 690061 is about 88.3681631565.

The spelling of 690061 in words is "six hundred ninety thousand, sixty-one".