7431994887 has 4 divisors (see below), whose sum is σ = 9909326520. Its totient is φ = 4954663256.

The previous prime is 7431994811. The next prime is 7431994891. The reversal of 7431994887 is 7884991347.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7884991347 = 3 ⋅2628330449.

It is a cyclic number.

It is not a de Polignac number, because 7431994887 - 2¹⁸ = 7431732743 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7431994887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7431994387) 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, 1238665812 + ... + 1238665817.

It is an arithmetic number, because the mean of its divisors is an integer number (2477331630).

Almost surely, 2^7431994887 is an apocalyptic number.

7431994887 is a deficient number, since it is larger than the sum of its proper divisors (2477331633).

7431994887 is a wasteful number, since it uses less digits than its factorization.

7431994887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2477331632.

The product of its digits is 12192768, while the sum is 60.

The square root of 7431994887 is about 86209.0185943443. The cubic root of 7431994887 is about 1951.4996036015.

The spelling of 7431994887 in words is "seven billion, four hundred thirty-one million, nine hundred ninety-four thousand, eight hundred eighty-seven".