79241432981 has 4 divisors (see below), whose sum is σ = 80736554412. Its totient is φ = 77746311552.

The previous prime is 79241432969. The next prime is 79241432999. The reversal of 79241432981 is 18923414297.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 56105501956 + 23135931025 = 236866^2 + 152105^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79241432981 is a prime.

It is a super-2 number, since 2×79241432981² (a number of 23 digits) 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 (79241462981) 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, 747560636 + ... + 747560741.

It is an arithmetic number, because the mean of its divisors is an integer number (20184138603).

Almost surely, 2^79241432981 is an apocalyptic number.

It is an amenable number.

79241432981 is a deficient number, since it is larger than the sum of its proper divisors (1495121431).

79241432981 is a wasteful number, since it uses less digits than its factorization.

79241432981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1495121430.

The product of its digits is 870912, while the sum is 50.

The spelling of 79241432981 in words is "seventy-nine billion, two hundred forty-one million, four hundred thirty-two thousand, nine hundred eighty-one".