126849721 has 2 divisors, whose sum is σ = 126849722. Its totient is φ = 126849720.

The previous prime is 126849707. The next prime is 126849739. The reversal of 126849721 is 127948621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124010496 + 2839225 = 11136^2 + 1685^2 .

It is a cyclic number.

It is not a de Polignac number, because 126849721 - 2¹¹ = 126847673 is a prime.

It is not a weakly prime, because it can be changed into another prime (126849791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63424860 + 63424861.

It is an arithmetic number, because the mean of its divisors is an integer number (63424861).

Almost surely, 2^126849721 is an apocalyptic number.

It is an amenable number.

126849721 is a deficient number, since it is larger than the sum of its proper divisors (1).

126849721 is an equidigital number, since it uses as much as digits as its factorization.

126849721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 40.

The square root of 126849721 is about 11262.7581435455. The cubic root of 126849721 is about 502.4542284819.

The spelling of 126849721 in words is "one hundred twenty-six million, eight hundred forty-nine thousand, seven hundred twenty-one".