690142221 has 8 divisors (see below), whose sum is σ = 1022432960. Its totient is φ = 460094796.

The previous prime is 690142213. The next prime is 690142231. The reversal of 690142221 is 122241096.

It is not a de Polignac number, because 690142221 - 2³ = 690142213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 25560823 = 690142221 / (6 + 9 + 0 + 1 + 4 + 2 + 2 + 2 + 1).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690142231) 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 7 ways as a sum of consecutive naturals, for example, 12780385 + ... + 12780438.

It is an arithmetic number, because the mean of its divisors is an integer number (127804120).

Almost surely, 2^690142221 is an apocalyptic number.

It is an amenable number.

690142221 is a deficient number, since it is larger than the sum of its proper divisors (332290739).

690142221 is a wasteful number, since it uses less digits than its factorization.

690142221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25560832 (or 25560826 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 690142221 is about 26270.5580641143. The cubic root of 690142221 is about 883.7163003314.

The spelling of 690142221 in words is "six hundred ninety million, one hundred forty-two thousand, two hundred twenty-one".