77907131 has 4 divisors (see below), whose sum is σ = 79069992. Its totient is φ = 76744272.

The previous prime is 77907121. The next prime is 77907143. The reversal of 77907131 is 13170977.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13170977 = 53 ⋅248509.

It is a cyclic number.

It is not a de Polignac number, because 77907131 - 2¹⁰ = 77906107 is a prime.

It is a super-2 number, since 2×77907131² = 12139042121302322, 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 = 77907091 and 77907100.

It is not an unprimeable number, because it can be changed into a prime (77907101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 581330 + ... + 581463.

It is an arithmetic number, because the mean of its divisors is an integer number (19767498).

Almost surely, 2^77907131 is an apocalyptic number.

77907131 is a deficient number, since it is larger than the sum of its proper divisors (1162861).

77907131 is a wasteful number, since it uses less digits than its factorization.

77907131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1162860.

The product of its (nonzero) digits is 9261, while the sum is 35.

The square root of 77907131 is about 8826.5016286182. The cubic root of 77907131 is about 427.0962292284.

The spelling of 77907131 in words is "seventy-seven million, nine hundred seven thousand, one hundred thirty-one".