126451891 has 4 divisors (see below), whose sum is σ = 126491832. Its totient is φ = 126411952.

The previous prime is 126451889. The next prime is 126451901. The reversal of 126451891 is 198154621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 126451891 - 2¹ = 126451889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 126451891.

It is not an unprimeable number, because it can be changed into a prime (126455891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14770 + ... + 21703.

It is an arithmetic number, because the mean of its divisors is an integer number (31622958).

Almost surely, 2^126451891 is an apocalyptic number.

126451891 is a deficient number, since it is larger than the sum of its proper divisors (39941).

126451891 is an equidigital number, since it uses as much as digits as its factorization.

126451891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39940.

The product of its digits is 17280, while the sum is 37.

The square root of 126451891 is about 11245.0829699029. The cubic root of 126451891 is about 501.9284075933.

The spelling of 126451891 in words is "one hundred twenty-six million, four hundred fifty-one thousand, eight hundred ninety-one".