690165442 has 4 divisors (see below), whose sum is σ = 1035248166. Its totient is φ = 345082720.

The previous prime is 690165391. The next prime is 690165449. The reversal of 690165442 is 244561096.

It is a Cunningham number, because it is equal to 26271²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 690165441 + 1 = 26271^2 + 1^2 .

It is not an unprimeable number, because it can be changed into a prime (690165449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172541359 + ... + 172541362.

Almost surely, 2^690165442 is an apocalyptic number.

690165442 is a deficient number, since it is larger than the sum of its proper divisors (345082724).

690165442 is a wasteful number, since it uses less digits than its factorization.

690165442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345082723.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 690165442 is about 26271.0000190324. Note that the first 4 decimals coincide. The cubic root of 690165442 is about 883.7262115958.

The spelling of 690165442 in words is "six hundred ninety million, one hundred sixty-five thousand, four hundred forty-two".