70040161 has 3 divisors (see below), whose sum is σ = 70048531. Its totient is φ = 70031792.

The previous prime is 70040123. The next prime is 70040197. The reversal of 70040161 is 16104007.

It is a happy number.

The square root of 70040161 is 8369.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 16104007 = 71 ⋅226817.

It can be written as a sum of positive squares in only one way, i.e., 50680161 + 19360000 = 7119^2 + 4400^2 .

It is not a de Polignac number, because 70040161 - 2⁹ = 70039649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70040101) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4185 + ... + 12553.

Almost surely, 2^70040161 is an apocalyptic number.

70040161 is the 8369-th square number.

70040161 is the 4185-th centered octagonal number.

It is an amenable number.

70040161 is a deficient number, since it is larger than the sum of its proper divisors (8370).

70040161 is an frugal number, since it uses more digits than its factorization.

70040161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16738 (or 8369 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 19.

The cubic root of 70040161 is about 412.2073315501.

Adding to 70040161 its reverse (16104007), we get a palindrome (86144168).

The spelling of 70040161 in words is "seventy million, forty thousand, one hundred sixty-one".