690690271 has 4 divisors (see below), whose sum is σ = 690748344. Its totient is φ = 690632200.

The previous prime is 690690241. The next prime is 690690277. The reversal of 690690271 is 172096096.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 690690271 - 2¹³ = 690682079 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690690277) 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, 4000 + ... + 37381.

It is an arithmetic number, because the mean of its divisors is an integer number (172687086).

Almost surely, 2^690690271 is an apocalyptic number.

690690271 is a deficient number, since it is larger than the sum of its proper divisors (58073).

690690271 is a wasteful number, since it uses less digits than its factorization.

690690271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58072.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 690690271 is about 26280.9868726424. The cubic root of 690690271 is about 883.9501615842.

The spelling of 690690271 in words is "six hundred ninety million, six hundred ninety thousand, two hundred seventy-one".