70561819 has 2 divisors, whose sum is σ = 70561820. Its totient is φ = 70561818.

The previous prime is 70561793. The next prime is 70561823. The reversal of 70561819 is 91816507.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 70561819 - 2¹¹ = 70559771 is a prime.

It is a super-2 number, since 2×70561819² = 9957940601177522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (70561889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35280909 + 35280910.

It is an arithmetic number, because the mean of its divisors is an integer number (35280910).

Almost surely, 2^70561819 is an apocalyptic number.

70561819 is a deficient number, since it is larger than the sum of its proper divisors (1).

70561819 is an equidigital number, since it uses as much as digits as its factorization.

70561819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 70561819 is about 8400.1082731117. The cubic root of 70561819 is about 413.2281725332.

The spelling of 70561819 in words is "seventy million, five hundred sixty-one thousand, eight hundred nineteen".