102001155019 has 4 divisors (see below), whose sum is σ = 103292308960. Its totient is φ = 100710001080.

The previous prime is 102001154999. The next prime is 102001155029. The reversal of 102001155019 is 910551100201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 910551100201 = 81031 ⋅11237071.

It is a cyclic number.

It is not a de Polignac number, because 102001155019 - 2¹¹ = 102001152971 is a prime.

It is a super-2 number, since 2×102001155019² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102001154984 and 102001155002.

It is not an unprimeable number, because it can be changed into a prime (102001155029) 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, 645576852 + ... + 645577009.

It is an arithmetic number, because the mean of its divisors is an integer number (25823077240).

Almost surely, 2^102001155019 is an apocalyptic number.

102001155019 is a deficient number, since it is larger than the sum of its proper divisors (1291153941).

102001155019 is an equidigital number, since it uses as much as digits as its factorization.

102001155019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1291153940.

The product of its (nonzero) digits is 450, while the sum is 25.

The spelling of 102001155019 in words is "one hundred two billion, one million, one hundred fifty-five thousand, nineteen".