122749 has 4 divisors (see below), whose sum is σ = 133920. Its totient is φ = 111580.

The previous prime is 122743. The next prime is 122753. The reversal of 122749 is 947221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 947221 = 11 ⋅86111.

It is a cyclic number.

It is not a de Polignac number, because 122749 - 2³ = 122741 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 (122741) 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, 5569 + ... + 5590.

It is an arithmetic number, because the mean of its divisors is an integer number (33480).

2¹²²⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

122749 is a deficient number, since it is larger than the sum of its proper divisors (11171).

122749 is a wasteful number, since it uses less digits than its factorization.

122749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11170.

The product of its digits is 1008, while the sum is 25.

The square root of 122749 is about 350.3555337083. The cubic root of 122749 is about 49.6980468230.

It can be divided in two parts, 122 and 749, that multiplied together give a triangular number (91378 = T₄₂₇).

The spelling of 122749 in words is "one hundred twenty-two thousand, seven hundred forty-nine".