124772561 has 4 divisors (see below), whose sum is σ = 124924992. Its totient is φ = 124620132.

The previous prime is 124772533. The next prime is 124772569. The reversal of 124772561 is 165277421.

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: 165277421 = 71 ⋅2327851.

It is a cyclic number.

It is not a de Polignac number, because 124772561 - 2²² = 120578257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (124772569) 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, 74981 + ... + 76626.

It is an arithmetic number, because the mean of its divisors is an integer number (31231248).

Almost surely, 2^124772561 is an apocalyptic number.

It is an amenable number.

124772561 is a deficient number, since it is larger than the sum of its proper divisors (152431).

124772561 is an equidigital number, since it uses as much as digits as its factorization.

124772561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152430.

The product of its digits is 23520, while the sum is 35.

The square root of 124772561 is about 11170.1638752527. The cubic root of 124772561 is about 499.6965638903.

The spelling of 124772561 in words is "one hundred twenty-four million, seven hundred seventy-two thousand, five hundred sixty-one".