81553095 has 64 divisors (see below), whose sum is σ = 161280000. Its totient is φ = 38828160.

The previous prime is 81553091. The next prime is 81553099. The reversal of 81553095 is 59035518.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81553091) and next prime (81553099).

It is not a de Polignac number, because 81553095 - 2² = 81553091 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81553091) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 53656 + ... + 55154.

It is an arithmetic number, because the mean of its divisors is an integer number (2520000).

Almost surely, 2^81553095 is an apocalyptic number.

81553095 is a deficient number, since it is larger than the sum of its proper divisors (79726905).

81553095 is a wasteful number, since it uses less digits than its factorization.

81553095 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1557 (or 1551 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The square root of 81553095 is about 9030.6752239243. The cubic root of 81553095 is about 433.6574540878.

The spelling of 81553095 in words is "eighty-one million, five hundred fifty-three thousand, ninety-five".