71251001 has 4 divisors (see below), whose sum is σ = 71268432. Its totient is φ = 71233572.

The previous prime is 71250973. The next prime is 71251021. The reversal of 71251001 is 10015217.

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 71251001 - 2¹⁸ = 70988857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71251021) 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, 1106 + ... + 11988.

It is an arithmetic number, because the mean of its divisors is an integer number (17817108).

Almost surely, 2^71251001 is an apocalyptic number.

It is an amenable number.

71251001 is a deficient number, since it is larger than the sum of its proper divisors (17431).

71251001 is a wasteful number, since it uses less digits than its factorization.

71251001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17430.

The product of its (nonzero) digits is 70, while the sum is 17.

The square root of 71251001 is about 8441.0308019815. The cubic root of 71251001 is about 414.5691585186.

Adding to 71251001 its reverse (10015217), we get a palindrome (81266218).

The spelling of 71251001 in words is "seventy-one million, two hundred fifty-one thousand, one".