690109855 has 4 divisors (see below), whose sum is σ = 828131832. Its totient is φ = 552087880.

The previous prime is 690109853. The next prime is 690109859. The reversal of 690109855 is 558901096.

It is a happy number.

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

It is not a de Polignac number, because 690109855 - 2¹ = 690109853 is a prime.

It is a super-2 number, since 2×690109855² = 952503223936242050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690109853) 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, 69010981 + ... + 69010990.

It is an arithmetic number, because the mean of its divisors is an integer number (207032958).

Almost surely, 2^690109855 is an apocalyptic number.

690109855 is a deficient number, since it is larger than the sum of its proper divisors (138021977).

690109855 is a wasteful number, since it uses less digits than its factorization.

690109855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138021976.

The product of its (nonzero) digits is 97200, while the sum is 43.

The square root of 690109855 is about 26269.9420440929. The cubic root of 690109855 is about 883.7024853968.

The spelling of 690109855 in words is "six hundred ninety million, one hundred nine thousand, eight hundred fifty-five".