71213512 has 8 divisors (see below), whose sum is σ = 133525350. Its totient is φ = 35606752.

The previous prime is 71213509. The next prime is 71213551. The reversal of 71213512 is 21531217.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 69122596 + 2090916 = 8314^2 + 1446^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4450837 + ... + 4450852.

Almost surely, 2^71213512 is an apocalyptic number.

It is an amenable number.

71213512 is a deficient number, since it is larger than the sum of its proper divisors (62311838).

71213512 is a wasteful number, since it uses less digits than its factorization.

71213512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8901695 (or 8901691 counting only the distinct ones).

The product of its digits is 420, while the sum is 22.

The square root of 71213512 is about 8438.8098686959. The cubic root of 71213512 is about 414.4964366876.

Adding to 71213512 its reverse (21531217), we get a palindrome (92744729).

The spelling of 71213512 in words is "seventy-one million, two hundred thirteen thousand, five hundred twelve".