81248153 has 16 divisors (see below), whose sum is σ = 94838784. Its totient is φ = 68167440.

The previous prime is 81248149. The next prime is 81248159. The reversal of 81248153 is 35184218.

It is a cyclic number.

It is not a de Polignac number, because 81248153 - 2² = 81248149 is a prime.

It is a super-2 number, since 2×81248153² = 13202524731822818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81248159) 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, 89126 + ... + 90032.

It is an arithmetic number, because the mean of its divisors is an integer number (5927424).

Almost surely, 2^81248153 is an apocalyptic number.

It is an amenable number.

81248153 is a deficient number, since it is larger than the sum of its proper divisors (13590631).

81248153 is a wasteful number, since it uses less digits than its factorization.

81248153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1172.

The product of its digits is 7680, while the sum is 32.

The square root of 81248153 is about 9013.7757349515. The cubic root of 81248153 is about 433.1162707099.

The spelling of 81248153 in words is "eighty-one million, two hundred forty-eight thousand, one hundred fifty-three".