81454629 has 4 divisors (see below), whose sum is σ = 108606176. Its totient is φ = 54303084.

The previous prime is 81454627. The next prime is 81454631. The reversal of 81454629 is 92645418.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (81454627) and next prime (81454631).

It is not a de Polignac number, because 81454629 - 2¹ = 81454627 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81454627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13575769 + ... + 13575774.

It is an arithmetic number, because the mean of its divisors is an integer number (27151544).

Almost surely, 2^81454629 is an apocalyptic number.

It is an amenable number.

81454629 is a deficient number, since it is larger than the sum of its proper divisors (27151547).

81454629 is a wasteful number, since it uses less digits than its factorization.

81454629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27151546.

The product of its digits is 69120, while the sum is 39.

The square root of 81454629 is about 9025.2218255287. The cubic root of 81454629 is about 433.4828532680.

The spelling of 81454629 in words is "eighty-one million, four hundred fifty-four thousand, six hundred twenty-nine".