124721749 has 2 divisors, whose sum is σ = 124721750. Its totient is φ = 124721748.

The previous prime is 124721689. The next prime is 124721761. The reversal of 124721749 is 947127421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63600625 + 61121124 = 7975^2 + 7818^2 .

It is an emirp because it is prime and its reverse (947127421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 124721749 - 2²³ = 116333141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (124721789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62360874 + 62360875.

It is an arithmetic number, because the mean of its divisors is an integer number (62360875).

Almost surely, 2^124721749 is an apocalyptic number.

It is an amenable number.

124721749 is a deficient number, since it is larger than the sum of its proper divisors (1).

124721749 is an equidigital number, since it uses as much as digits as its factorization.

124721749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 37.

The square root of 124721749 is about 11167.8891917855. The cubic root of 124721749 is about 499.6287230417.

The spelling of 124721749 in words is "one hundred twenty-four million, seven hundred twenty-one thousand, seven hundred forty-nine".