127621 has 4 divisors (see below), whose sum is σ = 137452. Its totient is φ = 117792.

The previous prime is 127609. The next prime is 127637. The reversal of 127621 is 126721.

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 83521 + 44100 = 289^2 + 210^2 .

It is a cyclic number.

It is not a de Polignac number, because 127621 - 2⁷ = 127493 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 (127601) 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, 4896 + ... + 4921.

It is an arithmetic number, because the mean of its divisors is an integer number (34363).

2¹²⁷⁶²¹ is an apocalyptic number.

It is an amenable number.

127621 is a deficient number, since it is larger than the sum of its proper divisors (9831).

127621 is an equidigital number, since it uses as much as digits as its factorization.

127621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9830.

The product of its digits is 168, while the sum is 19.

The square root of 127621 is about 357.2408151374. The cubic root of 127621 is about 50.3470521888.

Subtracting from 127621 its reverse (126721), we obtain a square (900 = 30²).

It can be divided in two parts, 1276 and 21, that multiplied together give a triangular number (26796 = T₂₃₁).

The spelling of 127621 in words is "one hundred twenty-seven thousand, six hundred twenty-one".