70145881 has 4 divisors (see below), whose sum is σ = 75541732. Its totient is φ = 64750032.

The previous prime is 70145879. The next prime is 70145903. The reversal of 70145881 is 18854107.

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 5198400 + 64947481 = 2280^2 + 8059^2 .

It is a cyclic number.

It is not a de Polignac number, because 70145881 - 2¹ = 70145879 is a prime.

It is a super-2 number, since 2×70145881² = 9840889242532322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70145861) 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, 2697906 + ... + 2697931.

It is an arithmetic number, because the mean of its divisors is an integer number (18885433).

Almost surely, 2^70145881 is an apocalyptic number.

It is an amenable number.

70145881 is a deficient number, since it is larger than the sum of its proper divisors (5395851).

70145881 is a wasteful number, since it uses less digits than its factorization.

70145881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5395850.

The product of its (nonzero) digits is 8960, while the sum is 34.

The square root of 70145881 is about 8375.3137851665. The cubic root of 70145881 is about 412.4146252453.

Adding to 70145881 its reverse (18854107), we get a palindrome (88999988).

The spelling of 70145881 in words is "seventy million, one hundred forty-five thousand, eight hundred eighty-one".