81154969 has 8 divisors (see below), whose sum is σ = 93600320. Its totient is φ = 68922576.

The previous prime is 81154961. The next prime is 81154973. The reversal of 81154969 is 96945118.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81154969 - 2³ = 81154961 is a prime.

It is a super-2 number, since 2×81154969² = 13172257986781922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81154961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52419 + ... + 53944.

It is an arithmetic number, because the mean of its divisors is an integer number (11700040).

Almost surely, 2^81154969 is an apocalyptic number.

It is an amenable number.

81154969 is a deficient number, since it is larger than the sum of its proper divisors (12445351).

81154969 is a wasteful number, since it uses less digits than its factorization.

81154969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106479.

The product of its digits is 77760, while the sum is 43.

The square root of 81154969 is about 9008.6052749579. The cubic root of 81154969 is about 432.9506261406.

The spelling of 81154969 in words is "eighty-one million, one hundred fifty-four thousand, nine hundred sixty-nine".