70172131 has 2 divisors, whose sum is σ = 70172132. Its totient is φ = 70172130.

The previous prime is 70172093. The next prime is 70172153. The reversal of 70172131 is 13127107.

It is an a-pointer prime, because the next prime (70172153) can be obtained adding 70172131 to its sum of digits (22).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 70172131 - 2¹¹ = 70170083 is a prime.

It is a super-2 number, since 2×70172131² = 9848255938162322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (70172161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35086065 + 35086066.

It is an arithmetic number, because the mean of its divisors is an integer number (35086066).

Almost surely, 2^70172131 is an apocalyptic number.

70172131 is a deficient number, since it is larger than the sum of its proper divisors (1).

70172131 is an equidigital number, since it uses as much as digits as its factorization.

70172131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 294, while the sum is 22.

The square root of 70172131 is about 8376.8807440479. The cubic root of 70172131 is about 412.4660634462.

Adding to 70172131 its reverse (13127107), we get a palindrome (83299238).

The spelling of 70172131 in words is "seventy million, one hundred seventy-two thousand, one hundred thirty-one".