102561501 has 8 divisors (see below), whose sum is σ = 156284224. Its totient is φ = 58606560.

The previous prime is 102561499. The next prime is 102561539. The reversal of 102561501 is 105165201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 102561501 - 2¹ = 102561499 is a prime.

It is a super-2 number, since 2×102561501² = 21037722974746002, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 4883881 = 102561501 / (1 + 0 + 2 + 5 + 6 + 1 + 5 + 0 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102561001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2441920 + ... + 2441961.

It is an arithmetic number, because the mean of its divisors is an integer number (19535528).

Almost surely, 2^102561501 is an apocalyptic number.

It is an amenable number.

102561501 is a deficient number, since it is larger than the sum of its proper divisors (53722723).

102561501 is an equidigital number, since it uses as much as digits as its factorization.

102561501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4883891.

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 102561501 is about 10127.2652280860. The cubic root of 102561501 is about 468.0886629811.

It can be divided in two parts, 1025 and 61501, that added together give a palindrome (62526).

The spelling of 102561501 in words is "one hundred two million, five hundred sixty-one thousand, five hundred one".