81629053 has 16 divisors (see below), whose sum is σ = 95147136. Its totient is φ = 69207040.

The previous prime is 81629029. The next prime is 81629059. The reversal of 81629053 is 35092618.

It is a cyclic number.

It is not a de Polignac number, because 81629053 - 2⁵ = 81629021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81629059) 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, 19200 + ... + 23062.

It is an arithmetic number, because the mean of its divisors is an integer number (5946696).

Almost surely, 2^81629053 is an apocalyptic number.

It is an amenable number.

81629053 is a deficient number, since it is larger than the sum of its proper divisors (13518083).

81629053 is a wasteful number, since it uses less digits than its factorization.

81629053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4004.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 81629053 is about 9034.8797999752. The cubic root of 81629053 is about 433.7920475146.

The spelling of 81629053 in words is "eighty-one million, six hundred twenty-nine thousand, fifty-three".