71551061 has 4 divisors (see below), whose sum is σ = 73073472. Its totient is φ = 70028652.

The previous prime is 71551043. The next prime is 71551099. The reversal of 71551061 is 16015517.

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 an emirpimes, since its reverse is a distinct semiprime: 16015517 = 7 ⋅2287931.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71551061 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 71551061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71551001) 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, 761135 + ... + 761228.

It is an arithmetic number, because the mean of its divisors is an integer number (18268368).

Almost surely, 2^71551061 is an apocalyptic number.

It is an amenable number.

71551061 is a deficient number, since it is larger than the sum of its proper divisors (1522411).

71551061 is a wasteful number, since it uses less digits than its factorization.

71551061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1522410.

The product of its (nonzero) digits is 1050, while the sum is 26.

The square root of 71551061 is about 8458.7860240108. The cubic root of 71551061 is about 415.1503031321.

Adding to 71551061 its reverse (16015517), we get a palindrome (87566578).

The spelling of 71551061 in words is "seventy-one million, five hundred fifty-one thousand, sixty-one".