81774001 has 16 divisors (see below), whose sum is σ = 86469120. Its totient is φ = 77235840.

The previous prime is 81773987. The next prime is 81774013. The reversal of 81774001 is 10047718.

It is a cyclic number.

It is not a de Polignac number, because 81774001 - 2⁷ = 81773873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81774041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 295075 + ... + 295351.

It is an arithmetic number, because the mean of its divisors is an integer number (5404320).

Almost surely, 2^81774001 is an apocalyptic number.

It is an amenable number.

81774001 is a deficient number, since it is larger than the sum of its proper divisors (4695119).

81774001 is a wasteful number, since it uses less digits than its factorization.

81774001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504.

The product of its (nonzero) digits is 1568, while the sum is 28.

The square root of 81774001 is about 9042.8978209421. The cubic root of 81774001 is about 434.0486559450.

The spelling of 81774001 in words is "eighty-one million, seven hundred seventy-four thousand, one".