127523921 has 12 divisors (see below), whose sum is σ = 148547700. Its totient is φ = 109156320.

The previous prime is 127523911. The next prime is 127523923. The reversal of 127523921 is 129325721.

It can be written as a sum of positive squares in 2 ways, for example, as 99221521 + 28302400 = 9961^2 + 5320^2 .

It is not a de Polignac number, because 127523921 - 2⁶ = 127523857 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (127523923) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48755 + ... + 51303.

It is an arithmetic number, because the mean of its divisors is an integer number (12378975).

Almost surely, 2^127523921 is an apocalyptic number.

It is an amenable number.

127523921 is a deficient number, since it is larger than the sum of its proper divisors (21023779).

127523921 is a wasteful number, since it uses less digits than its factorization.

127523921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3584 (or 3577 counting only the distinct ones).

The product of its digits is 7560, while the sum is 32.

The square root of 127523921 is about 11292.6489806422. The cubic root of 127523921 is about 503.3428291802.

The spelling of 127523921 in words is "one hundred twenty-seven million, five hundred twenty-three thousand, nine hundred twenty-one".