101249109 has 24 divisors (see below), whose sum is σ = 163336992. Its totient is φ = 62305200.

The previous prime is 101249101. The next prime is 101249111. The reversal of 101249109 is 901942101.

It is not a de Polignac number, because 101249109 - 2³ = 101249101 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101249101) 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 23 ways as a sum of consecutive naturals, for example, 12867 + ... + 19184.

It is an arithmetic number, because the mean of its divisors is an integer number (6805708).

Almost surely, 2^101249109 is an apocalyptic number.

It is an amenable number.

101249109 is a deficient number, since it is larger than the sum of its proper divisors (62087883).

101249109 is an equidigital number, since it uses as much as digits as its factorization.

101249109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32079 (or 32067 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 101249109 is about 10062.2616245057. The cubic root of 101249109 is about 466.0835087068.

The spelling of 101249109 in words is "one hundred one million, two hundred forty-nine thousand, one hundred nine".