124721761 has 2 divisors, whose sum is σ = 124721762. Its totient is φ = 124721760.

The previous prime is 124721749. The next prime is 124721767. The reversal of 124721761 is 167127421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119771136 + 4950625 = 10944^2 + 2225^2 .

It is a cyclic number.

It is not a de Polignac number, because 124721761 - 2⁷ = 124721633 is a prime.

It is a super-2 number, since 2×124721761² = 31111035333882242, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (124721767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62360880 + 62360881.

It is an arithmetic number, because the mean of its divisors is an integer number (62360881).

Almost surely, 2^124721761 is an apocalyptic number.

It is an amenable number.

124721761 is a deficient number, since it is larger than the sum of its proper divisors (1).

124721761 is an equidigital number, since it uses as much as digits as its factorization.

124721761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4704, while the sum is 31.

The square root of 124721761 is about 11167.8897290401. The cubic root of 124721761 is about 499.6287390655.

The spelling of 124721761 in words is "one hundred twenty-four million, seven hundred twenty-one thousand, seven hundred sixty-one".