70145531 has 4 divisors (see below), whose sum is σ = 70170600. Its totient is φ = 70120464.

The previous prime is 70145521. The next prime is 70145557. The reversal of 70145531 is 13554107.

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

It is a cyclic number.

It is not a de Polignac number, because 70145531 - 2¹⁰ = 70144507 is a prime.

It is a super-2 number, since 2×70145531² = 9840791038543922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 70145531.

It is not an unprimeable number, because it can be changed into a prime (70145521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7721 + ... + 14138.

It is an arithmetic number, because the mean of its divisors is an integer number (17542650).

Almost surely, 2^70145531 is an apocalyptic number.

70145531 is a deficient number, since it is larger than the sum of its proper divisors (25069).

70145531 is a wasteful number, since it uses less digits than its factorization.

70145531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25068.

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 70145531 is about 8375.2928904009. The cubic root of 70145531 is about 412.4139393159.

Adding to 70145531 its reverse (13554107), we get a palindrome (83699638).

The spelling of 70145531 in words is "seventy million, one hundred forty-five thousand, five hundred thirty-one".