8141621591 has 4 divisors (see below), whose sum is σ = 8330961672. Its totient is φ = 7952281512.

The previous prime is 8141621569. The next prime is 8141621629. The reversal of 8141621591 is 1951261418.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1951261418 = 2 ⋅975630709.

It is a cyclic number.

It is not a de Polignac number, because 8141621591 - 2²⁶ = 8074512727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8141621561) 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, 94669976 + ... + 94670061.

It is an arithmetic number, because the mean of its divisors is an integer number (2082740418).

Almost surely, 2^8141621591 is an apocalyptic number.

8141621591 is a deficient number, since it is larger than the sum of its proper divisors (189340081).

8141621591 is a wasteful number, since it uses less digits than its factorization.

8141621591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189340080.

The product of its digits is 17280, while the sum is 38.

The square root of 8141621591 is about 90230.9347784894. The cubic root of 8141621591 is about 2011.7328349474.

The spelling of 8141621591 in words is "eight billion, one hundred forty-one million, six hundred twenty-one thousand, five hundred ninety-one".