71077381 has 4 divisors (see below), whose sum is σ = 71596332. Its totient is φ = 70558432.

The previous prime is 71077367. The next prime is 71077387. The reversal of 71077381 is 18377017.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36796356 + 34281025 = 6066^2 + 5855^2 .

It is a cyclic number.

It is not a de Polignac number, because 71077381 - 2¹³ = 71069189 is a prime.

It is a super-2 number, since 2×71077381² = 10103988179638322, 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 (71077387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 259270 + ... + 259543.

It is an arithmetic number, because the mean of its divisors is an integer number (17899083).

Almost surely, 2^71077381 is an apocalyptic number.

It is an amenable number.

71077381 is a deficient number, since it is larger than the sum of its proper divisors (518951).

71077381 is a wasteful number, since it uses less digits than its factorization.

71077381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518950.

The product of its (nonzero) digits is 8232, while the sum is 34.

The square root of 71077381 is about 8430.7402403348. The cubic root of 71077381 is about 414.2321525398.

The spelling of 71077381 in words is "seventy-one million, seventy-seven thousand, three hundred eighty-one".