127171052551 has 4 divisors (see below), whose sum is σ = 128013245104. Its totient is φ = 126328860000.

The previous prime is 127171052461. The next prime is 127171052587. The reversal of 127171052551 is 155250171721.

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

It is a cyclic number.

It is not a de Polignac number, because 127171052551 - 2¹⁵ = 127171019783 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 127171052551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127171052051) 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, 421096050 + ... + 421096351.

It is an arithmetic number, because the mean of its divisors is an integer number (32003311276).

Almost surely, 2^127171052551 is an apocalyptic number.

127171052551 is a deficient number, since it is larger than the sum of its proper divisors (842192553).

127171052551 is an equidigital number, since it uses as much as digits as its factorization.

127171052551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842192552.

The product of its (nonzero) digits is 24500, while the sum is 37.

The spelling of 127171052551 in words is "one hundred twenty-seven billion, one hundred seventy-one million, fifty-two thousand, five hundred fifty-one".