7761323381 has 4 divisors (see below), whose sum is σ = 8870083872. Its totient is φ = 6652562892.

The previous prime is 7761323363. The next prime is 7761323407. The reversal of 7761323381 is 1833231677.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1833231677 = 823 ⋅2227499.

It is a cyclic number.

It is not a de Polignac number, because 7761323381 - 2¹⁰ = 7761322357 is a prime.

It is a super-2 number, since 2×7761323381² (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 (7761323341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 554380235 + ... + 554380248.

It is an arithmetic number, because the mean of its divisors is an integer number (2217520968).

Almost surely, 2^7761323381 is an apocalyptic number.

It is an amenable number.

7761323381 is a deficient number, since it is larger than the sum of its proper divisors (1108760491).

7761323381 is a wasteful number, since it uses less digits than its factorization.

7761323381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1108760490.

The product of its digits is 127008, while the sum is 41.

The square root of 7761323381 is about 88098.3733164240. The cubic root of 7761323381 is about 1979.9091361391.

The spelling of 7761323381 in words is "seven billion, seven hundred sixty-one million, three hundred twenty-three thousand, three hundred eighty-one".