102111131 has 4 divisors (see below), whose sum is σ = 102339000. Its totient is φ = 101883264.

The previous prime is 102111103. The next prime is 102111151. The reversal of 102111131 is 131111201.

It is a happy number.

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 102111131 - 2²² = 97916827 is a prime.

It is a super-2 number, since 2×102111131² = 20853366148198322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102111151) 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, 113261 + ... + 114158.

It is an arithmetic number, because the mean of its divisors is an integer number (25584750).

Almost surely, 2^102111131 is an apocalyptic number.

102111131 is a deficient number, since it is larger than the sum of its proper divisors (227869).

102111131 is an equidigital number, since it uses as much as digits as its factorization.

102111131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227868.

The product of its (nonzero) digits is 6, while the sum is 11.

The square root of 102111131 is about 10105.0052449269. The cubic root of 102111131 is about 467.4024977060.

Adding to 102111131 its reverse (131111201), we get a palindrome (233222332).

The spelling of 102111131 in words is "one hundred two million, one hundred eleven thousand, one hundred thirty-one".