71381906 has 4 divisors (see below), whose sum is σ = 107072862. Its totient is φ = 35690952.

The previous prime is 71381899. The next prime is 71381911. The reversal of 71381906 is 60918317.

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., 70644025 + 737881 = 8405^2 + 859^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17845475 + ... + 17845478.

Almost surely, 2^71381906 is an apocalyptic number.

71381906 is a deficient number, since it is larger than the sum of its proper divisors (35690956).

71381906 is a wasteful number, since it uses less digits than its factorization.

71381906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35690955.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 71381906 is about 8448.7813322396. The cubic root of 71381906 is about 414.8228905070.

The spelling of 71381906 in words is "seventy-one million, three hundred eighty-one thousand, nine hundred six".