81602153 has 2 divisors, whose sum is σ = 81602154. Its totient is φ = 81602152.

The previous prime is 81602117. The next prime is 81602161. The reversal of 81602153 is 35120618.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44049769 + 37552384 = 6637^2 + 6128^2 .

It is a cyclic number.

It is not a de Polignac number, because 81602153 - 2¹⁰ = 81601129 is a prime.

It is a super-2 number, since 2×81602153² = 13317822748470818, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81602173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40801076 + 40801077.

It is an arithmetic number, because the mean of its divisors is an integer number (40801077).

Almost surely, 2^81602153 is an apocalyptic number.

It is an amenable number.

81602153 is a deficient number, since it is larger than the sum of its proper divisors (1).

81602153 is an equidigital number, since it uses as much as digits as its factorization.

81602153 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 81602153 is about 9033.3910022759. The cubic root of 81602153 is about 433.7443917365.

The spelling of 81602153 in words is "eighty-one million, six hundred two thousand, one hundred fifty-three".