87971069951 has 4 divisors (see below), whose sum is σ = 87977739072. Its totient is φ = 87964400832.

The previous prime is 87971069929. The next prime is 87971069983. The reversal of 87971069951 is 15996017978.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87971069951 is a prime.

It is a super-4 number, since 4×87971069951⁴ (a number of 45 digits) contains 4444 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 (87971069911) 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, 3314735 + ... + 3341168.

It is an arithmetic number, because the mean of its divisors is an integer number (21994434768).

Almost surely, 2^87971069951 is an apocalyptic number.

87971069951 is a deficient number, since it is larger than the sum of its proper divisors (6669121).

87971069951 is a wasteful number, since it uses less digits than its factorization.

87971069951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6669120.

The product of its (nonzero) digits is 8573040, while the sum is 62.

The spelling of 87971069951 in words is "eighty-seven billion, nine hundred seventy-one million, sixty-nine thousand, nine hundred fifty-one".