102897781 has 8 divisors (see below), whose sum is σ = 117782784. Its totient is φ = 88059120.

The previous prime is 102897763. The next prime is 102897793. The reversal of 102897781 is 187798201.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 102897781 - 2⁹ = 102897269 is a prime.

It is a super-2 number, since 2×102897781² = 21175906669447922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102897731) 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, 6685 + ... + 15826.

It is an arithmetic number, because the mean of its divisors is an integer number (14722848).

Almost surely, 2^102897781 is an apocalyptic number.

It is an amenable number.

102897781 is a deficient number, since it is larger than the sum of its proper divisors (14885003).

102897781 is an equidigital number, since it uses as much as digits as its factorization.

102897781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23171.

The product of its (nonzero) digits is 56448, while the sum is 43.

The square root of 102897781 is about 10143.8543463518. The cubic root of 102897781 is about 468.5996966167.

The spelling of 102897781 in words is "one hundred two million, eight hundred ninety-seven thousand, seven hundred eighty-one".