102420031 has 4 divisors (see below), whose sum is σ = 117051472. Its totient is φ = 87788592.

The previous prime is 102419987. The next prime is 102420061. The reversal of 102420031 is 130024201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 130024201 = 19 ⋅6843379.

It is a cyclic number.

It is not a de Polignac number, because 102420031 - 2¹³ = 102411839 is a prime.

It is a super-2 number, since 2×102420031² = 20979725500081922, 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 = 102419993 and 102420020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102420061) 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, 7315710 + ... + 7315723.

It is an arithmetic number, because the mean of its divisors is an integer number (29262868).

Almost surely, 2^102420031 is an apocalyptic number.

102420031 is a deficient number, since it is larger than the sum of its proper divisors (14631441).

102420031 is an equidigital number, since it uses as much as digits as its factorization.

102420031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14631440.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 102420031 is about 10120.2782076384. The cubic root of 102420031 is about 467.8733418540.

Adding to 102420031 its reverse (130024201), we get a palindrome (232444232).

The spelling of 102420031 in words is "one hundred two million, four hundred twenty thousand, thirty-one".