71542157 has 8 divisors (see below), whose sum is σ = 72067320. Its totient is φ = 71019520.

The previous prime is 71542151. The next prime is 71542181. The reversal of 71542157 is 75124517.

It can be written as a sum of positive squares in 4 ways, for example, as 662596 + 70879561 = 814^2 + 8419^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71542157 - 2²² = 67347853 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 (71542151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137057 + ... + 137577.

It is an arithmetic number, because the mean of its divisors is an integer number (9008415).

Almost surely, 2^71542157 is an apocalyptic number.

It is an amenable number.

71542157 is a deficient number, since it is larger than the sum of its proper divisors (525163).

71542157 is a wasteful number, since it uses less digits than its factorization.

71542157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1263.

The product of its digits is 9800, while the sum is 32.

The square root of 71542157 is about 8458.2596909766. The cubic root of 71542157 is about 415.1330816235.

The spelling of 71542157 in words is "seventy-one million, five hundred forty-two thousand, one hundred fifty-seven".