1231680749 has 8 divisors (see below), whose sum is σ = 1326743040. Its totient is φ = 1136663856.

The previous prime is 1231680647. The next prime is 1231680761. The reversal of 1231680749 is 9470861321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231680749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231680799) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63164 + ... + 80330.

It is an arithmetic number, because the mean of its divisors is an integer number (165842880).

Almost surely, 2^1231680749 is an apocalyptic number.

It is an amenable number.

1231680749 is a deficient number, since it is larger than the sum of its proper divisors (95062291).

1231680749 is a wasteful number, since it uses less digits than its factorization.

1231680749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22699.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 1231680749 is about 35095.3095014134. The cubic root of 1231680749 is about 1071.9290757103.

The spelling of 1231680749 in words is "one billion, two hundred thirty-one million, six hundred eighty thousand, seven hundred forty-nine".