102087649 has 4 divisors (see below), whose sum is σ = 102236080. Its totient is φ = 101939220.

The previous prime is 102087613. The next prime is 102087659. The reversal of 102087649 is 946780201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102087649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102087659) 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, 73179 + ... + 74560.

It is an arithmetic number, because the mean of its divisors is an integer number (25559020).

Almost surely, 2^102087649 is an apocalyptic number.

It is an amenable number.

102087649 is a deficient number, since it is larger than the sum of its proper divisors (148431).

102087649 is an equidigital number, since it uses as much as digits as its factorization.

102087649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148430.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 102087649 is about 10103.8432786737. The cubic root of 102087649 is about 467.3666661998.

The spelling of 102087649 in words is "one hundred two million, eighty-seven thousand, six hundred forty-nine".