71259421 has 4 divisors (see below), whose sum is σ = 73558144. Its totient is φ = 68960700.

The previous prime is 71259413. The next prime is 71259437. The reversal of 71259421 is 12495217.

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 71259421 - 2³ = 71259413 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 2298691 = 71259421 / (7 + 1 + 2 + 5 + 9 + 4 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71251421) 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, 1149315 + ... + 1149376.

It is an arithmetic number, because the mean of its divisors is an integer number (18389536).

Almost surely, 2^71259421 is an apocalyptic number.

It is an amenable number.

71259421 is a deficient number, since it is larger than the sum of its proper divisors (2298723).

71259421 is a wasteful number, since it uses less digits than its factorization.

71259421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2298722.

The product of its digits is 5040, while the sum is 31.

The square root of 71259421 is about 8441.5295414990. The cubic root of 71259421 is about 414.5854882767.

The spelling of 71259421 in words is "seventy-one million, two hundred fifty-nine thousand, four hundred twenty-one".