102111540 has 24 divisors (see below), whose sum is σ = 285912480. Its totient is φ = 27229728.

The previous prime is 102111533. The next prime is 102111547. The reversal of 102111540 is 45111201.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (102111533) and next prime (102111547).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102111547) 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 7 ways as a sum of consecutive naturals, for example, 850870 + ... + 850989.

It is an arithmetic number, because the mean of its divisors is an integer number (11913020).

Almost surely, 2^102111540 is an apocalyptic number.

102111540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102111540 is an abundant number, since it is smaller than the sum of its proper divisors (183800940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

102111540 is a wasteful number, since it uses less digits than its factorization.

102111540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1701871 (or 1701869 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 102111540 is about 10105.0254824023. The cubic root of 102111540 is about 467.4031217561.

Adding to 102111540 its reverse (45111201), we get a palindrome (147222741).

It can be divided in two parts, 1021 and 11540, that added together give a triangular number (12561 = T₁₅₈).

The spelling of 102111540 in words is "one hundred two million, one hundred eleven thousand, five hundred forty".