71457251 has 4 divisors (see below), whose sum is σ = 74564112. Its totient is φ = 68350392.

The previous prime is 71457241. The next prime is 71457257. The reversal of 71457251 is 15275417.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15275417 = 2579 ⋅5923.

It is a cyclic number.

It is not a de Polignac number, because 71457251 - 2¹⁰ = 71456227 is a prime.

It is a super-2 number, since 2×71457251² = 10212277440954002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71457257) 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, 1553396 + ... + 1553441.

It is an arithmetic number, because the mean of its divisors is an integer number (18641028).

Almost surely, 2^71457251 is an apocalyptic number.

71457251 is a deficient number, since it is larger than the sum of its proper divisors (3106861).

71457251 is a wasteful number, since it uses less digits than its factorization.

71457251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3106860.

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

The square root of 71457251 is about 8453.2390833337. The cubic root of 71457251 is about 414.9687904144.

The spelling of 71457251 in words is "seventy-one million, four hundred fifty-seven thousand, two hundred fifty-one".