71401781 has 8 divisors (see below), whose sum is σ = 79170528. Its totient is φ = 63846000.

The previous prime is 71401777. The next prime is 71401783. The reversal of 71401781 is 18710417.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71401781 - 2² = 71401777 is a prime.

It is a super-2 number, since 2×71401781² = 10196428659943922, 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 (71401783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52535 + ... + 53876.

It is an arithmetic number, because the mean of its divisors is an integer number (9896316).

Almost surely, 2^71401781 is an apocalyptic number.

It is an amenable number.

71401781 is a deficient number, since it is larger than the sum of its proper divisors (7768747).

71401781 is a wasteful number, since it uses less digits than its factorization.

71401781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106483.

The product of its (nonzero) digits is 1568, while the sum is 29.

The square root of 71401781 is about 8449.9574555142. The cubic root of 71401781 is about 414.8613869100.

The spelling of 71401781 in words is "seventy-one million, four hundred one thousand, seven hundred eighty-one".