71531477 has 4 divisors (see below), whose sum is σ = 73838976. Its totient is φ = 69223980.

The previous prime is 71531441. The next prime is 71531483. The reversal of 71531477 is 77413517.

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: 77413517 = 3727 ⋅20771.

It is a cyclic number.

It is not a de Polignac number, because 71531477 - 2⁶ = 71531413 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 (71531407) 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, 1153703 + ... + 1153764.

It is an arithmetic number, because the mean of its divisors is an integer number (18459744).

Almost surely, 2^71531477 is an apocalyptic number.

It is an amenable number.

71531477 is a deficient number, since it is larger than the sum of its proper divisors (2307499).

71531477 is a wasteful number, since it uses less digits than its factorization.

71531477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2307498.

The product of its digits is 20580, while the sum is 35.

The square root of 71531477 is about 8457.6283318670. The cubic root of 71531477 is about 415.1124232120.

The spelling of 71531477 in words is "seventy-one million, five hundred thirty-one thousand, four hundred seventy-seven".