612578881 has 2 divisors, whose sum is σ = 612578882. Its totient is φ = 612578880.

The previous prime is 612578839. The next prime is 612578891. The reversal of 612578881 is 188875216.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 579124225 + 33454656 = 24065^2 + 5784^2 .

It is a cyclic number.

It is not a de Polignac number, because 612578881 - 2¹³ = 612570689 is a prime.

It is a super-2 number, since 2×612578881² = 750505770894424322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (612578831) 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, 306289440 + 306289441.

It is an arithmetic number, because the mean of its divisors is an integer number (306289441).

Almost surely, 2^612578881 is an apocalyptic number.

It is an amenable number.

612578881 is a deficient number, since it is larger than the sum of its proper divisors (1).

612578881 is an equidigital number, since it uses as much as digits as its factorization.

612578881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 215040, while the sum is 46.

The square root of 612578881 is about 24750.3309270806. The cubic root of 612578881 is about 849.2860815137.

The spelling of 612578881 in words is "six hundred twelve million, five hundred seventy-eight thousand, eight hundred eighty-one".