71649213 has 4 divisors (see below), whose sum is σ = 95532288. Its totient is φ = 47766140.

The previous prime is 71649173. The next prime is 71649217. The reversal of 71649213 is 31294617.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31294617 = 3 ⋅10431539.

It is a cyclic number.

It is not a de Polignac number, because 71649213 - 2¹⁰ = 71648189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71649217) 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, 11941533 + ... + 11941538.

It is an arithmetic number, because the mean of its divisors is an integer number (23883072).

Almost surely, 2^71649213 is an apocalyptic number.

It is an amenable number.

71649213 is a deficient number, since it is larger than the sum of its proper divisors (23883075).

71649213 is a wasteful number, since it uses less digits than its factorization.

71649213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23883074.

The product of its digits is 9072, while the sum is 33.

The square root of 71649213 is about 8464.5858138482. The cubic root of 71649213 is about 415.3400474158.

The spelling of 71649213 in words is "seventy-one million, six hundred forty-nine thousand, two hundred thirteen".