80136621 has 10 divisors (see below), whose sum is σ = 119710382. Its totient is φ = 53424360.

The previous prime is 80136613. The next prime is 80136629. The reversal of 80136621 is 12663108.

80136621 is a `hidden beast` number, since 8 + 0 + 1 + 36 + 621 = 666.

It is an interprime number because it is at equal distance from previous prime (80136613) and next prime (80136629).

It can be written as a sum of positive squares in only one way, i.e., 63441225 + 16695396 = 7965^2 + 4086^2 .

It is not a de Polignac number, because 80136621 - 2³ = 80136613 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80136629) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 494590 + ... + 494751.

Almost surely, 2^80136621 is an apocalyptic number.

80136621 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

80136621 is a deficient number, since it is larger than the sum of its proper divisors (39573761).

80136621 is an equidigital number, since it uses as much as digits as its factorization.

80136621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989353 (or 989344 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 80136621 is about 8951.9059981660. The cubic root of 80136621 is about 431.1320826945.

Adding to 80136621 its reverse (12663108), we get a palindrome (92799729).

The spelling of 80136621 in words is "eighty million, one hundred thirty-six thousand, six hundred twenty-one".