690379831 has 4 divisors (see below), whose sum is σ = 690945552. Its totient is φ = 689814112.

The previous prime is 690379819. The next prime is 690379841. The reversal of 690379831 is 138973096.

690379831 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.

It is a cyclic number.

It is not a de Polignac number, because 690379831 - 2¹³ = 690371639 is a prime.

It is a super-2 number, since 2×690379831² = 953248622103177122, 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 (690379841) 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, 281026 + ... + 283471.

It is an arithmetic number, because the mean of its divisors is an integer number (172736388).

Almost surely, 2^690379831 is an apocalyptic number.

690379831 is a deficient number, since it is larger than the sum of its proper divisors (565721).

690379831 is a wasteful number, since it uses less digits than its factorization.

690379831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565720.

The product of its (nonzero) digits is 244944, while the sum is 46.

The square root of 690379831 is about 26275.0800379371. The cubic root of 690379831 is about 883.8177073217.

The spelling of 690379831 in words is "six hundred ninety million, three hundred seventy-nine thousand, eight hundred thirty-one".