690547331 has 4 divisors (see below), whose sum is σ = 720571152. Its totient is φ = 660523512.

The previous prime is 690547309. The next prime is 690547337. The reversal of 690547331 is 133745096.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690547331 is a prime.

It is a super-2 number, since 2×690547331² = 953711232702447122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690547337) 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 3 ways as a sum of consecutive naturals, for example, 15011876 + ... + 15011921.

It is an arithmetic number, because the mean of its divisors is an integer number (180142788).

Almost surely, 2^690547331 is an apocalyptic number.

690547331 is a deficient number, since it is larger than the sum of its proper divisors (30023821).

690547331 is a wasteful number, since it uses less digits than its factorization.

690547331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30023820.

The product of its (nonzero) digits is 68040, while the sum is 38.

The square root of 690547331 is about 26278.2672754503. The cubic root of 690547331 is about 883.8891788453.

The spelling of 690547331 in words is "six hundred ninety million, five hundred forty-seven thousand, three hundred thirty-one".