77135231 has 12 divisors (see below), whose sum is σ = 82552032. Its totient is φ = 72049824.

The previous prime is 77135221. The next prime is 77135237. The reversal of 77135231 is 13253177.

It is not a de Polignac number, because 77135231 - 2⁶ = 77135167 is a prime.

It is a super-2 number, since 2×77135231² = 11899687722846722, 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 = 77135194 and 77135203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77135237) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24890 + ... + 27816.

It is an arithmetic number, because the mean of its divisors is an integer number (6879336).

Almost surely, 2^77135231 is an apocalyptic number.

77135231 is a deficient number, since it is larger than the sum of its proper divisors (5416801).

77135231 is a wasteful number, since it uses less digits than its factorization.

77135231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3038 (or 3019 counting only the distinct ones).

The product of its digits is 4410, while the sum is 29.

The square root of 77135231 is about 8782.6665085269. Note that the first 3 decimals coincide. The cubic root of 77135231 is about 425.6809954267.

The spelling of 77135231 in words is "seventy-seven million, one hundred thirty-five thousand, two hundred thirty-one".