127661945 has 4 divisors (see below), whose sum is σ = 153194340. Its totient is φ = 102129552.

The previous prime is 127661929. The next prime is 127661957. The reversal of 127661945 is 549166721.

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 79941481 + 47720464 = 8941^2 + 6908^2 .

It is a cyclic number.

It is not a de Polignac number, because 127661945 - 2⁴ = 127661929 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12766190 + ... + 12766199.

It is an arithmetic number, because the mean of its divisors is an integer number (38298585).

Almost surely, 2^127661945 is an apocalyptic number.

It is an amenable number.

127661945 is a deficient number, since it is larger than the sum of its proper divisors (25532395).

127661945 is an equidigital number, since it uses as much as digits as its factorization.

127661945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25532394.

The product of its digits is 90720, while the sum is 41.

The square root of 127661945 is about 11298.7585601251. The cubic root of 127661945 is about 503.5243594129.

The spelling of 127661945 in words is "one hundred twenty-seven million, six hundred sixty-one thousand, nine hundred forty-five".