77135381 has 4 divisors (see below), whose sum is σ = 77187552. Its totient is φ = 77083212.

The previous prime is 77135371. The next prime is 77135393. The reversal of 77135381 is 18353177.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77135381 is a prime.

It is a super-2 number, since 2×77135381² = 11899734004030322, which 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 (77135371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23801 + ... + 26846.

It is an arithmetic number, because the mean of its divisors is an integer number (19296888).

Almost surely, 2^77135381 is an apocalyptic number.

It is an amenable number.

77135381 is a deficient number, since it is larger than the sum of its proper divisors (52171).

77135381 is a wasteful number, since it uses less digits than its factorization.

77135381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52170.

The product of its digits is 17640, while the sum is 35.

The square root of 77135381 is about 8782.6750480705. The cubic root of 77135381 is about 425.6812713582.

The spelling of 77135381 in words is "seventy-seven million, one hundred thirty-five thousand, three hundred eighty-one".