6930731645 has 4 divisors (see below), whose sum is σ = 8316877980. Its totient is φ = 5544585312.

The previous prime is 6930731641. The next prime is 6930731693. The reversal of 6930731645 is 5461370396.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3326290276 + 3604441369 = 57674^2 + 60037^2 .

It is a cyclic number.

It is not a de Polignac number, because 6930731645 - 2² = 6930731641 is a prime.

It is a super-2 number, since 2×6930731645² = 96070082270008812050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6930731596 and 6930731605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6930731641) 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, 693073160 + ... + 693073169.

It is an arithmetic number, because the mean of its divisors is an integer number (2079219495).

Almost surely, 2^6930731645 is an apocalyptic number.

It is an amenable number.

6930731645 is a deficient number, since it is larger than the sum of its proper divisors (1386146335).

6930731645 is a wasteful number, since it uses less digits than its factorization.

6930731645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1386146334.

The product of its (nonzero) digits is 408240, while the sum is 44.

The square root of 6930731645 is about 83251.0158796876. The cubic root of 6930731645 is about 1906.6004644962.

The spelling of 6930731645 in words is "six billion, nine hundred thirty million, seven hundred thirty-one thousand, six hundred forty-five".