102581998 has 4 divisors (see below), whose sum is σ = 153873000. Its totient is φ = 51290998.

The previous prime is 102581989. The next prime is 102582017. The reversal of 102581998 is 899185201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 899185201 = 61 ⋅14740741.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25645498 + ... + 25645501.

It is an arithmetic number, because the mean of its divisors is an integer number (38468250).

Almost surely, 2^102581998 is an apocalyptic number.

102581998 is a deficient number, since it is larger than the sum of its proper divisors (51291002).

102581998 is an equidigital number, since it uses as much as digits as its factorization.

102581998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51291001.

The product of its (nonzero) digits is 51840, while the sum is 43.

The square root of 102581998 is about 10128.2771486566. The cubic root of 102581998 is about 468.1198435383.

The spelling of 102581998 in words is "one hundred two million, five hundred eighty-one thousand, nine hundred ninety-eight".