126952721 has 4 divisors (see below), whose sum is σ = 145088832. Its totient is φ = 108816612.

The previous prime is 126952717. The next prime is 126952729. The reversal of 126952721 is 127259621.

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.

It is a cyclic number.

It is not a de Polignac number, because 126952721 - 2² = 126952717 is a prime.

It is a super-2 number, since 2×126952721² = 32233986738607682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (126952729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9068045 + ... + 9068058.

It is an arithmetic number, because the mean of its divisors is an integer number (36272208).

Almost surely, 2^126952721 is an apocalyptic number.

It is an amenable number.

126952721 is a deficient number, since it is larger than the sum of its proper divisors (18136111).

126952721 is an equidigital number, since it uses as much as digits as its factorization.

126952721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18136110.

The product of its digits is 15120, while the sum is 35.

The square root of 126952721 is about 11267.3298079004. The cubic root of 126952721 is about 502.5901866955.

The spelling of 126952721 in words is "one hundred twenty-six million, nine hundred fifty-two thousand, seven hundred twenty-one".