71478981 has 12 divisors (see below), whose sum is σ = 117997152. Its totient is φ = 40845096.

The previous prime is 71478977. The next prime is 71478983. The reversal of 71478981 is 18987417.

It is not a de Polignac number, because 71478981 - 2² = 71478977 is a prime.

It is a super-2 number, since 2×71478981² = 10218489449596722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71478983) 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, 567231 + ... + 567356.

It is an arithmetic number, because the mean of its divisors is an integer number (9833096).

Almost surely, 2^71478981 is an apocalyptic number.

It is an amenable number.

71478981 is a deficient number, since it is larger than the sum of its proper divisors (46518171).

71478981 is a wasteful number, since it uses less digits than its factorization.

71478981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1134600 (or 1134597 counting only the distinct ones).

The product of its digits is 112896, while the sum is 45.

The square root of 71478981 is about 8454.5242917624. The cubic root of 71478981 is about 415.0108498639.

The spelling of 71478981 in words is "seventy-one million, four hundred seventy-eight thousand, nine hundred eighty-one".