124904989561 has 45 divisors (see below), whose sum is σ = 146566155743. Its totient is φ = 106364982240.

The previous prime is 124904989549. The next prime is 124904989571. The reversal of 124904989561 is 165989409421.

The square root of 124904989561 is 353419.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 23984407161 + 100920582400 = 154869^2 + 317680^2 .

It is not a de Polignac number, because 124904989561 - 2²³ = 124896600953 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 124904989496 and 124904989505.

It is not an unprimeable number, because it can be changed into a prime (124904989571) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 1403426805 + ... + 1403426893.

Almost surely, 2^124904989561 is an apocalyptic number.

124904989561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

124904989561 is the 353419-th square number.

124904989561 is the 176710-th centered octagonal number.

It is an amenable number.

124904989561 is a deficient number, since it is larger than the sum of its proper divisors (21661166182).

124904989561 is an frugal number, since it uses more digits than its factorization.

124904989561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 58.

The spelling of 124904989561 in words is "one hundred twenty-four billion, nine hundred four million, nine hundred eighty-nine thousand, five hundred sixty-one".