80642951 has 4 divisors (see below), whose sum is σ = 85386672. Its totient is φ = 75899232.

The previous prime is 80642867. The next prime is 80642957. The reversal of 80642951 is 15924608.

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

It is a cyclic number.

It is not a de Polignac number, because 80642951 - 2¹⁰ = 80641927 is a prime.

It is a super-3 number, since 3×80642951³ (a number of 25 digits) contains 333 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 (80642957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2371835 + ... + 2371868.

It is an arithmetic number, because the mean of its divisors is an integer number (21346668).

Almost surely, 2^80642951 is an apocalyptic number.

80642951 is a deficient number, since it is larger than the sum of its proper divisors (4743721).

80642951 is a wasteful number, since it uses less digits than its factorization.

80642951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4743720.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 80642951 is about 8980.1420367386. The cubic root of 80642951 is about 432.0381892822.

The spelling of 80642951 in words is "eighty million, six hundred forty-two thousand, nine hundred fifty-one".