126321457 has 4 divisors (see below), whose sum is σ = 127439460. Its totient is φ = 125203456.

The previous prime is 126321431. The next prime is 126321467. The reversal of 126321457 is 754123621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 754123621 = 17 ⋅44360213.

It can be written as a sum of positive squares in 2 ways, for example, as 7096896 + 119224561 = 2664^2 + 10919^2 .

It is a cyclic number.

It is not a de Polignac number, because 126321457 - 2²³ = 117932849 is a prime.

It is a super-2 number, since 2×126321457² = 31914220997205698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126321467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 558832 + ... + 559057.

It is an arithmetic number, because the mean of its divisors is an integer number (31859865).

Almost surely, 2^126321457 is an apocalyptic number.

It is an amenable number.

126321457 is a deficient number, since it is larger than the sum of its proper divisors (1118003).

126321457 is a wasteful number, since it uses less digits than its factorization.

126321457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1118002.

The product of its digits is 10080, while the sum is 31.

The square root of 126321457 is about 11239.2818720771. The cubic root of 126321457 is about 501.7557699934.

The spelling of 126321457 in words is "one hundred twenty-six million, three hundred twenty-one thousand, four hundred fifty-seven".