71542949 has 4 divisors (see below), whose sum is σ = 74653536. Its totient is φ = 68432364.

The previous prime is 71542931. The next prime is 71542957. The reversal of 71542949 is 94924517.

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.

It is a cyclic number.

It is not a de Polignac number, because 71542949 - 2²⁰ = 70494373 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 (71542969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1555259 + ... + 1555304.

It is an arithmetic number, because the mean of its divisors is an integer number (18663384).

Almost surely, 2^71542949 is an apocalyptic number.

It is an amenable number.

71542949 is a deficient number, since it is larger than the sum of its proper divisors (3110587).

71542949 is a wasteful number, since it uses less digits than its factorization.

71542949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3110586.

The product of its digits is 90720, while the sum is 41.

The square root of 71542949 is about 8458.3065089887. The cubic root of 71542949 is about 415.1346135137.

The spelling of 71542949 in words is "seventy-one million, five hundred forty-two thousand, nine hundred forty-nine".