127649561 has 16 divisors (see below), whose sum is σ = 142699200. Its totient is φ = 113375808.

The previous prime is 127649531. The next prime is 127649567. The reversal of 127649561 is 165946721.

It is not a de Polignac number, because 127649561 - 2⁶ = 127649497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127649567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 205910 + ... + 206528.

It is an arithmetic number, because the mean of its divisors is an integer number (8918700).

Almost surely, 2^127649561 is an apocalyptic number.

It is an amenable number.

127649561 is a deficient number, since it is larger than the sum of its proper divisors (15049639).

127649561 is a wasteful number, since it uses less digits than its factorization.

127649561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1208.

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

The square root of 127649561 is about 11298.2105220252. The cubic root of 127649561 is about 503.5080772250.

The spelling of 127649561 in words is "one hundred twenty-seven million, six hundred forty-nine thousand, five hundred sixty-one".