1612278881 has 2 divisors, whose sum is σ = 1612278882. Its totient is φ = 1612278880.

The previous prime is 1612278869. The next prime is 1612278887. The reversal of 1612278881 is 1888722161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 972441856 + 639837025 = 31184^2 + 25295^2 .

It is a cyclic number.

It is not a de Polignac number, because 1612278881 - 2¹⁸ = 1612016737 is a prime.

It is a super-2 number, since 2×1612278881² = 5198886380237224322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1612278887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 806139440 + 806139441.

It is an arithmetic number, because the mean of its divisors is an integer number (806139441).

Almost surely, 2^1612278881 is an apocalyptic number.

It is an amenable number.

1612278881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1612278881 is an equidigital number, since it uses as much as digits as its factorization.

1612278881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86016, while the sum is 44.

The square root of 1612278881 is about 40153.1926626016. The cubic root of 1612278881 is about 1172.5914461405.

The spelling of 1612278881 in words is "one billion, six hundred twelve million, two hundred seventy-eight thousand, eight hundred eighty-one".