102820031 has 4 divisors (see below), whose sum is σ = 102865392. Its totient is φ = 102774672.

The previous prime is 102819991. The next prime is 102820033. The reversal of 102820031 is 130028201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 130028201 = 1283 ⋅101347.

It is a cyclic number.

It is not a de Polignac number, because 102820031 - 2⁶ = 102819967 is a prime.

It is a super-2 number, since 2×102820031² = 21143917549681922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102819991 and 102820009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102820033) 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, 19091 + ... + 23876.

It is an arithmetic number, because the mean of its divisors is an integer number (25716348).

Almost surely, 2^102820031 is an apocalyptic number.

102820031 is a deficient number, since it is larger than the sum of its proper divisors (45361).

102820031 is an equidigital number, since it uses as much as digits as its factorization.

102820031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45360.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 102820031 is about 10140.0212524432. The cubic root of 102820031 is about 468.4816415710.

Adding to 102820031 its reverse (130028201), we get a palindrome (232848232).

The spelling of 102820031 in words is "one hundred two million, eight hundred twenty thousand, thirty-one".