71551253 has 4 divisors (see below), whose sum is σ = 71568288. Its totient is φ = 71534220.

The previous prime is 71551211. The next prime is 71551297. The reversal of 71551253 is 35215517.

It is a happy number.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71551253 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71551153) 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, 2768 + ... + 12278.

It is an arithmetic number, because the mean of its divisors is an integer number (17892072).

Almost surely, 2^71551253 is an apocalyptic number.

It is an amenable number.

71551253 is a deficient number, since it is larger than the sum of its proper divisors (17035).

71551253 is an equidigital number, since it uses as much as digits as its factorization.

71551253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17034.

The product of its digits is 5250, while the sum is 29.

The square root of 71551253 is about 8458.7973731494. The cubic root of 71551253 is about 415.1506744696.

The spelling of 71551253 in words is "seventy-one million, five hundred fifty-one thousand, two hundred fifty-three".