10124999891 has 2 divisors, whose sum is σ = 10124999892. Its totient is φ = 10124999890.

The previous prime is 10124999887. The next prime is 10124999921. The reversal of 10124999891 is 19899942101.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 10124999891 - 2² = 10124999887 is a prime.

It is not a weakly prime, because it can be changed into another prime (10124999861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5062499945 + 5062499946.

It is an arithmetic number, because the mean of its divisors is an integer number (5062499946).

Almost surely, 2^10124999891 is an apocalyptic number.

10124999891 is a deficient number, since it is larger than the sum of its proper divisors (1).

10124999891 is an equidigital number, since it uses as much as digits as its factorization.

10124999891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 419904, while the sum is 53.

The spelling of 10124999891 in words is "ten billion, one hundred twenty-four million, nine hundred ninety-nine thousand, eight hundred ninety-one".