7142770781 has 4 divisors (see below), whose sum is σ = 7194907932. Its totient is φ = 7090633632.

The previous prime is 7142770777. The next prime is 7142770787. The reversal of 7142770781 is 1870772417.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1870772417 = 103 ⋅18162839.

It can be written as a sum of positive squares in 2 ways, for example, as 3955152100 + 3187618681 = 62890^2 + 56459^2 .

It is a cyclic number.

It is not a de Polignac number, because 7142770781 - 2² = 7142770777 is a prime.

It is a super-2 number, since 2×7142770781² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7142770787) 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 in 3 ways as a sum of consecutive naturals, for example, 26068370 + ... + 26068643.

It is an arithmetic number, because the mean of its divisors is an integer number (1798726983).

Almost surely, 2^7142770781 is an apocalyptic number.

It is an amenable number.

7142770781 is a deficient number, since it is larger than the sum of its proper divisors (52137151).

7142770781 is a wasteful number, since it uses less digits than its factorization.

7142770781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52137150.

The product of its (nonzero) digits is 153664, while the sum is 44.

The square root of 7142770781 is about 84514.9145476702. The cubic root of 7142770781 is about 1925.8490238964.

The spelling of 7142770781 in words is "seven billion, one hundred forty-two million, seven hundred seventy thousand, seven hundred eighty-one".