81263061 has 16 divisors (see below), whose sum is σ = 131334720. Its totient is φ = 49250160.

The previous prime is 81263029. The next prime is 81263081. The reversal of 81263061 is 16036218.

It is not a de Polignac number, because 81263061 - 2⁵ = 81263029 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81263081) 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, 136510 + ... + 137103.

It is an arithmetic number, because the mean of its divisors is an integer number (8208420).

Almost surely, 2^81263061 is an apocalyptic number.

It is an amenable number.

81263061 is a deficient number, since it is larger than the sum of its proper divisors (50071659).

81263061 is a wasteful number, since it uses less digits than its factorization.

81263061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273633 (or 273627 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 81263061 is about 9014.6026534729. The cubic root of 81263061 is about 433.1427595274.

Adding to 81263061 its reverse (16036218), we get a palindrome (97299279).

The spelling of 81263061 in words is "eighty-one million, two hundred sixty-three thousand, sixty-one".