71851049 has 4 divisors (see below), whose sum is σ = 72548736. Its totient is φ = 71153364.

The previous prime is 71851037. The next prime is 71851051. The reversal of 71851049 is 94015817.

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: 94015817 = 7 ⋅13430831.

It is a cyclic number.

It is not a de Polignac number, because 71851049 - 2¹² = 71846953 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71853049) 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, 348689 + ... + 348894.

It is an arithmetic number, because the mean of its divisors is an integer number (18137184).

Almost surely, 2^71851049 is an apocalyptic number.

It is an amenable number.

71851049 is a deficient number, since it is larger than the sum of its proper divisors (697687).

71851049 is a wasteful number, since it uses less digits than its factorization.

71851049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697686.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 71851049 is about 8476.4998082935. The cubic root of 71851049 is about 415.7296864003.

The spelling of 71851049 in words is "seventy-one million, eight hundred fifty-one thousand, forty-nine".