81400611 has 16 divisors (see below), whose sum is σ = 113773824. Its totient is φ = 51669024.

The previous prime is 81400603. The next prime is 81400661. The reversal of 81400611 is 11600418.

It is not a de Polignac number, because 81400611 - 2³ = 81400603 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81400661) 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, 13065 + ... + 18261.

It is an arithmetic number, because the mean of its divisors is an integer number (7110864).

Almost surely, 2^81400611 is an apocalyptic number.

81400611 is a deficient number, since it is larger than the sum of its proper divisors (32373213).

81400611 is a wasteful number, since it uses less digits than its factorization.

81400611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5450.

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 81400611 is about 9022.2287157886. The cubic root of 81400611 is about 433.3870082757.

The spelling of 81400611 in words is "eighty-one million, four hundred thousand, six hundred eleven".