10126991 has 4 divisors (see below), whose sum is σ = 11573712. Its totient is φ = 8680272.

The previous prime is 10126939. The next prime is 10126993. The reversal of 10126991 is 19962101.

10126991 is digitally balanced in base 2 and base 8, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19962101 = 857 ⋅23293.

It is a cyclic number.

It is not a de Polignac number, because 10126991 - 2¹⁸ = 9864847 is a prime.

It is a Duffinian number.

10126991 is strictly pandigital in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10126993) 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, 723350 + ... + 723363.

It is an arithmetic number, because the mean of its divisors is an integer number (2893428).

Almost surely, 2^10126991 is an apocalyptic number.

10126991 is a deficient number, since it is larger than the sum of its proper divisors (1446721).

10126991 is an equidigital number, since it uses as much as digits as its factorization.

10126991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1446720.

The product of its (nonzero) digits is 972, while the sum is 29.

The square root of 10126991 is about 3182.2933554278. The cubic root of 10126991 is about 216.3516149569.

The spelling of 10126991 in words is "ten million, one hundred twenty-six thousand, nine hundred ninety-one".