71257551 has 16 divisors (see below), whose sum is σ = 96307200. Its totient is φ = 46860768.

The previous prime is 71257513. The next prime is 71257559. The reversal of 71257551 is 15575217.

It is not a de Polignac number, because 71257551 - 2¹⁷ = 71126479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71257559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117090 + ... + 117696.

It is an arithmetic number, because the mean of its divisors is an integer number (6019200).

Almost surely, 2^71257551 is an apocalyptic number.

71257551 is a deficient number, since it is larger than the sum of its proper divisors (25049649).

71257551 is a wasteful number, since it uses less digits than its factorization.

71257551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1078.

The product of its digits is 12250, while the sum is 33.

The square root of 71257551 is about 8441.4187788547. The cubic root of 71257551 is about 414.5818617076.

The spelling of 71257551 in words is "seventy-one million, two hundred fifty-seven thousand, five hundred fifty-one".