743131681 has 4 divisors (see below), whose sum is σ = 745757872. Its totient is φ = 740505492.

The previous prime is 743131673. The next prime is 743131759. The reversal of 743131681 is 186131347.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 743131681 - 2³ = 743131673 is a prime.

It is a super-2 number, since 2×743131681² = 1104489390611771522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (743131651) 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, 1312671 + ... + 1313236.

It is an arithmetic number, because the mean of its divisors is an integer number (186439468).

Almost surely, 2^743131681 is an apocalyptic number.

It is an amenable number.

743131681 is a deficient number, since it is larger than the sum of its proper divisors (2626191).

743131681 is a wasteful number, since it uses less digits than its factorization.

743131681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2626190.

The product of its digits is 12096, while the sum is 34.

The square root of 743131681 is about 27260.4416875442. The cubic root of 743131681 is about 905.7783282137.

The spelling of 743131681 in words is "seven hundred forty-three million, one hundred thirty-one thousand, six hundred eighty-one".