71399506 has 4 divisors (see below), whose sum is σ = 107099262. Its totient is φ = 35699752.

The previous prime is 71399501. The next prime is 71399513. The reversal of 71399506 is 60599317.

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

It can be written as a sum of positive squares in only one way, i.e., 37933281 + 33466225 = 6159^2 + 5785^2 .

It is not an unprimeable number, because it can be changed into a prime (71399501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17849875 + ... + 17849878.

Almost surely, 2^71399506 is an apocalyptic number.

71399506 is a deficient number, since it is larger than the sum of its proper divisors (35699756).

71399506 is a wasteful number, since it uses less digits than its factorization.

71399506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35699755.

The product of its (nonzero) digits is 51030, while the sum is 40.

The square root of 71399506 is about 8449.8228383795. The cubic root of 71399506 is about 414.8569807656.

The spelling of 71399506 in words is "seventy-one million, three hundred ninety-nine thousand, five hundred six".