70872161 has 2 divisors, whose sum is σ = 70872162. Its totient is φ = 70872160.

The previous prime is 70872121. The next prime is 70872173. The reversal of 70872161 is 16127807.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65302561 + 5569600 = 8081^2 + 2360^2 .

It is a cyclic number.

It is not a de Polignac number, because 70872161 - 2¹⁸ = 70610017 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (70872101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35436080 + 35436081.

It is an arithmetic number, because the mean of its divisors is an integer number (35436081).

Almost surely, 2^70872161 is an apocalyptic number.

It is an amenable number.

70872161 is a deficient number, since it is larger than the sum of its proper divisors (1).

70872161 is an equidigital number, since it uses as much as digits as its factorization.

70872161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704, while the sum is 32.

The square root of 70872161 is about 8418.5605064049. The cubic root of 70872161 is about 413.8331007497.

Adding to 70872161 its reverse (16127807), we get a palindrome (86999968).

The spelling of 70872161 in words is "seventy million, eight hundred seventy-two thousand, one hundred sixty-one".