781052122 has 4 divisors (see below), whose sum is σ = 1171578186. Its totient is φ = 390526060.

The previous prime is 781052117. The next prime is 781052123. The reversal of 781052122 is 221250187.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 221250187 = 239 ⋅925733.

It can be written as a sum of positive squares in only one way, i.e., 559369801 + 221682321 = 23651^2 + 14889^2 .

It is a super-2 number, since 2×781052122² = 1220084834561405768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (781052123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195263029 + ... + 195263032.

Almost surely, 2^781052122 is an apocalyptic number.

781052122 is a deficient number, since it is larger than the sum of its proper divisors (390526064).

781052122 is a wasteful number, since it uses less digits than its factorization.

781052122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390526063.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 781052122 is about 27947.3097453046. The cubic root of 781052122 is about 920.9301092904.

The spelling of 781052122 in words is "seven hundred eighty-one million, fifty-two thousand, one hundred twenty-two".