102499661 has 16 divisors (see below), whose sum is σ = 122826240. Its totient is φ = 84435120.

The previous prime is 102499651. The next prime is 102499693. The reversal of 102499661 is 166994201.

It is not a de Polignac number, because 102499661 - 2⁶ = 102499597 is a prime.

It is a super-2 number, since 2×102499661² = 21012361010229842, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102499651) 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 15 ways as a sum of consecutive naturals, for example, 5855 + ... + 15468.

It is an arithmetic number, because the mean of its divisors is an integer number (7676640).

Almost surely, 2^102499661 is an apocalyptic number.

102499661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

102499661 is a deficient number, since it is larger than the sum of its proper divisors (20326579).

102499661 is a wasteful number, since it uses less digits than its factorization.

102499661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21376.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 102499661 is about 10124.2116236278. The cubic root of 102499661 is about 467.9945652204.

The spelling of 102499661 in words is "one hundred two million, four hundred ninety-nine thousand, six hundred sixty-one".