71421551 has 8 divisors (see below), whose sum is σ = 77606400. Its totient is φ = 65479320.

The previous prime is 71421541. The next prime is 71421599. The reversal of 71421551 is 15512417.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 71421551 - 2¹⁰ = 71420527 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71421551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71421541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60041 + ... + 61218.

It is an arithmetic number, because the mean of its divisors is an integer number (9700800).

Almost surely, 2^71421551 is an apocalyptic number.

71421551 is a deficient number, since it is larger than the sum of its proper divisors (6184849).

71421551 is a wasteful number, since it uses less digits than its factorization.

71421551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121309.

The product of its digits is 1400, while the sum is 26.

The square root of 71421551 is about 8451.1272029239. The cubic root of 71421551 is about 414.8996728493.

Adding to 71421551 its reverse (15512417), we get a palindrome (86933968).

The spelling of 71421551 in words is "seventy-one million, four hundred twenty-one thousand, five hundred fifty-one".