81070153 has 2 divisors, whose sum is σ = 81070154. Its totient is φ = 81070152.

The previous prime is 81070139. The next prime is 81070163. The reversal of 81070153 is 35107018.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76265289 + 4804864 = 8733^2 + 2192^2 .

It is a cyclic number.

It is not a de Polignac number, because 81070153 - 2¹⁷ = 80939081 is a prime.

It is not a weakly prime, because it can be changed into another prime (81070133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40535076 + 40535077.

It is an arithmetic number, because the mean of its divisors is an integer number (40535077).

Almost surely, 2^81070153 is an apocalyptic number.

It is an amenable number.

81070153 is a deficient number, since it is larger than the sum of its proper divisors (1).

81070153 is an equidigital number, since it uses as much as digits as its factorization.

81070153 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 81070153 is about 9003.8965453852. The cubic root of 81070153 is about 432.7997463249.

It can be divided in two parts, 8107015 and 3, that added together give a palindrome (8107018).

The spelling of 81070153 in words is "eighty-one million, seventy thousand, one hundred fifty-three".