102436491981 has 4 divisors (see below), whose sum is σ = 136581989312. Its totient is φ = 68290994652.

The previous prime is 102436491979. The next prime is 102436492019. The reversal of 102436491981 is 189194634201.

It is a happy number.

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 not a de Polignac number, because 102436491981 - 2¹ = 102436491979 is a prime.

It is a super-2 number, since 2×102436491981² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 102436491981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102436491901) 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, 17072748661 + ... + 17072748666.

It is an arithmetic number, because the mean of its divisors is an integer number (34145497328).

Almost surely, 2^102436491981 is an apocalyptic number.

It is an amenable number.

102436491981 is a deficient number, since it is larger than the sum of its proper divisors (34145497331).

102436491981 is an equidigital number, since it uses as much as digits as its factorization.

102436491981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34145497330.

The product of its (nonzero) digits is 373248, while the sum is 48.

The spelling of 102436491981 in words is "one hundred two billion, four hundred thirty-six million, four hundred ninety-one thousand, nine hundred eighty-one".