781201120102 has 16 divisors (see below), whose sum is σ = 1267499488752. Its totient is φ = 358966015200.

The previous prime is 781201120019. The next prime is 781201120129. The reversal of 781201120102 is 201021102187.

It is a happy number.

It is a super-2 number, since 2×781201120102² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66175149 + ... + 66186952.

It is an arithmetic number, because the mean of its divisors is an integer number (79218718047).

Almost surely, 2^781201120102 is an apocalyptic number.

781201120102 is a deficient number, since it is larger than the sum of its proper divisors (486298368650).

781201120102 is a wasteful number, since it uses less digits than its factorization.

781201120102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132362343.

The product of its (nonzero) digits is 448, while the sum is 25.

Adding to 781201120102 its reverse (201021102187), we get a palindrome (982222222289).

The spelling of 781201120102 in words is "seven hundred eighty-one billion, two hundred one million, one hundred twenty thousand, one hundred two".