874640981 has 4 divisors (see below), whose sum is σ = 887695392. Its totient is φ = 861586572.

The previous prime is 874640933. The next prime is 874640983. The reversal of 874640981 is 189046478.

874640981 is digitally balanced in base 2, because in such base 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: 189046478 = 2 ⋅94523239.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-874640981 is a prime.

It is a super-2 number, since 2×874640981² = 1529993691289284722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (874640983) 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, 6527105 + ... + 6527238.

It is an arithmetic number, because the mean of its divisors is an integer number (221923848).

Almost surely, 2^874640981 is an apocalyptic number.

It is an amenable number.

874640981 is a deficient number, since it is larger than the sum of its proper divisors (13054411).

874640981 is a wasteful number, since it uses less digits than its factorization.

874640981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13054410.

The product of its (nonzero) digits is 387072, while the sum is 47.

The square root of 874640981 is about 29574.3297641722. The cubic root of 874640981 is about 956.3347585116.

The spelling of 874640981 in words is "eight hundred seventy-four million, six hundred forty thousand, nine hundred eighty-one".