3143697981 has 4 divisors (see below), whose sum is σ = 4191597312. Its totient is φ = 2095798652.

The previous prime is 3143697959. The next prime is 3143698039. The reversal of 3143697981 is 1897963413.

3143697981 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1897963413 = 3 ⋅632654471.

It is a cyclic number.

It is not a de Polignac number, because 3143697981 - 2⁷ = 3143697853 is a prime.

It is a super-2 number, since 2×3143697981² = 19765673991486952722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3143697901) 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, 523949661 + ... + 523949666.

It is an arithmetic number, because the mean of its divisors is an integer number (1047899328).

Almost surely, 2^3143697981 is an apocalyptic number.

It is an amenable number.

3143697981 is a deficient number, since it is larger than the sum of its proper divisors (1047899331).

3143697981 is a wasteful number, since it uses less digits than its factorization.

3143697981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1047899330.

The product of its digits is 979776, while the sum is 51.

The square root of 3143697981 is about 56068.6898455814. The cubic root of 3143697981 is about 1464.9189782291.

The spelling of 3143697981 in words is "three billion, one hundred forty-three million, six hundred ninety-seven thousand, nine hundred eighty-one".