71951869 has 4 divisors (see below), whose sum is σ = 78492960. Its totient is φ = 65410780.

The previous prime is 71951863. The next prime is 71951909. The reversal of 71951869 is 96815917.

It is a happy number.

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: 96815917 = 11 ⋅8801447.

It is a cyclic number.

It is not a de Polignac number, because 71951869 - 2²³ = 63563261 is a prime.

It is a super-2 number, since 2×71951869² = 10354142905186322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71951863) 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, 3270529 + ... + 3270550.

It is an arithmetic number, because the mean of its divisors is an integer number (19623240).

Almost surely, 2^71951869 is an apocalyptic number.

It is an amenable number.

71951869 is a deficient number, since it is larger than the sum of its proper divisors (6541091).

71951869 is a wasteful number, since it uses less digits than its factorization.

71951869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6541090.

The product of its digits is 136080, while the sum is 46.

The square root of 71951869 is about 8482.4447537252. Note that the first 3 decimals coincide. The cubic root of 71951869 is about 415.9240434700.

The spelling of 71951869 in words is "seventy-one million, nine hundred fifty-one thousand, eight hundred sixty-nine".