71578151 has 4 divisors (see below), whose sum is σ = 72791400. Its totient is φ = 70364904.

The previous prime is 71578147. The next prime is 71578201. The reversal of 71578151 is 15187517.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15187517 = 19 ⋅799343.

It is a cyclic number.

It is not a de Polignac number, because 71578151 - 2² = 71578147 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71578141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 606536 + ... + 606653.

It is an arithmetic number, because the mean of its divisors is an integer number (18197850).

Almost surely, 2^71578151 is an apocalyptic number.

71578151 is a deficient number, since it is larger than the sum of its proper divisors (1213249).

71578151 is a wasteful number, since it uses less digits than its factorization.

71578151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1213248.

The product of its digits is 9800, while the sum is 35.

The square root of 71578151 is about 8460.3871660817. The cubic root of 71578151 is about 415.2026899754.

The spelling of 71578151 in words is "seventy-one million, five hundred seventy-eight thousand, one hundred fifty-one".