70947581 has 4 divisors (see below), whose sum is σ = 72457152. Its totient is φ = 69438012.

The previous prime is 70947557. The next prime is 70947607. The reversal of 70947581 is 18574907.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18574907 = 13 ⋅1428839.

It is a cyclic number.

It is not a de Polignac number, because 70947581 - 2¹⁴ = 70931197 is a prime.

It is a super-2 number, since 2×70947581² = 10067118499503122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70941581) 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, 754715 + ... + 754808.

It is an arithmetic number, because the mean of its divisors is an integer number (18114288).

Almost surely, 2^70947581 is an apocalyptic number.

It is an amenable number.

70947581 is a deficient number, since it is larger than the sum of its proper divisors (1509571).

70947581 is a wasteful number, since it uses less digits than its factorization.

70947581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1509570.

The product of its (nonzero) digits is 70560, while the sum is 41.

The square root of 70947581 is about 8423.0387034609. The cubic root of 70947581 is about 413.9798449117.

The spelling of 70947581 in words is "seventy million, nine hundred forty-seven thousand, five hundred eighty-one".