70145161 has 4 divisors (see below), whose sum is σ = 70346500. Its totient is φ = 69943824.

The previous prime is 70145149. The next prime is 70145167. The reversal of 70145161 is 16154107.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 57471561 + 12673600 = 7581^2 + 3560^2 .

It is a cyclic number.

It is not a de Polignac number, because 70145161 - 2¹¹ = 70143113 is a prime.

It is a super-2 number, since 2×70145161² = 9840687223431842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70145167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100146 + ... + 100843.

It is an arithmetic number, because the mean of its divisors is an integer number (17586625).

Almost surely, 2^70145161 is an apocalyptic number.

It is an amenable number.

70145161 is a deficient number, since it is larger than the sum of its proper divisors (201339).

70145161 is a wasteful number, since it uses less digits than its factorization.

70145161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201338.

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

The square root of 70145161 is about 8375.2708015920. The cubic root of 70145161 is about 412.4132141881.

Adding to 70145161 its reverse (16154107), we get a palindrome (86299268).

The spelling of 70145161 in words is "seventy million, one hundred forty-five thousand, one hundred sixty-one".