70561919 has 4 divisors (see below), whose sum is σ = 70580520. Its totient is φ = 70543320.

The previous prime is 70561903. The next prime is 70561927. The reversal of 70561919 is 91916507.

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 70561919 - 2⁴ = 70561903 is a prime.

It is a super-2 number, since 2×70561919² = 9957968825925122, 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 (70561019) 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, 1337 + ... + 11954.

It is an arithmetic number, because the mean of its divisors is an integer number (17645130).

Almost surely, 2^70561919 is an apocalyptic number.

70561919 is a deficient number, since it is larger than the sum of its proper divisors (18601).

70561919 is a wasteful number, since it uses less digits than its factorization.

70561919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18600.

The product of its (nonzero) digits is 17010, while the sum is 38.

The square root of 70561919 is about 8400.1142254138. The cubic root of 70561919 is about 413.2283677417.

The spelling of 70561919 in words is "seventy million, five hundred sixty-one thousand, nine hundred nineteen".