80692021 has 4 divisors (see below), whose sum is σ = 80750700. Its totient is φ = 80633344.

The previous prime is 80691991. The next prime is 80692049. The reversal of 80692021 is 12029608.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 36469521 + 44222500 = 6039^2 + 6650^2 .

It is a cyclic number.

It is not a de Polignac number, because 80692021 - 2⁹ = 80691509 is a prime.

It is a super-2 number, since 2×80692021² = 13022404506128882, 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 (80692121) 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, 27226 + ... + 30043.

It is an arithmetic number, because the mean of its divisors is an integer number (20187675).

Almost surely, 2^80692021 is an apocalyptic number.

It is an amenable number.

80692021 is a deficient number, since it is larger than the sum of its proper divisors (58679).

80692021 is a wasteful number, since it uses less digits than its factorization.

80692021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58678.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 80692021 is about 8982.8737606626. The cubic root of 80692021 is about 432.1258010539.

The spelling of 80692021 in words is "eighty million, six hundred ninety-two thousand, twenty-one".