81674151 has 12 divisors (see below), whose sum is σ = 117920808. Its totient is φ = 50260704.

The previous prime is 81674147. The next prime is 81674161. The reversal of 81674151 is 15147618.

It is a happy number.

It is not a de Polignac number, because 81674151 - 2² = 81674147 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81674101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 80040 + ... + 81053.

It is an arithmetic number, because the mean of its divisors is an integer number (9826734).

Almost surely, 2^81674151 is an apocalyptic number.

81674151 is a deficient number, since it is larger than the sum of its proper divisors (36246657).

81674151 is a wasteful number, since it uses less digits than its factorization.

81674151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161122 (or 161109 counting only the distinct ones).

The product of its digits is 6720, while the sum is 33.

The square root of 81674151 is about 9037.3752273545. The cubic root of 81674151 is about 433.8719192083.

The spelling of 81674151 in words is "eighty-one million, six hundred seventy-four thousand, one hundred fifty-one".