881620409 has 2 divisors, whose sum is σ = 881620410. Its totient is φ = 881620408.

The previous prime is 881620403. The next prime is 881620457. The reversal of 881620409 is 904026188.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 804970384 + 76650025 = 28372^2 + 8755^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-881620409 is a prime.

It is not a weakly prime, because it can be changed into another prime (881620403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 440810204 + 440810205.

It is an arithmetic number, because the mean of its divisors is an integer number (440810205).

Almost surely, 2^881620409 is an apocalyptic number.

It is an amenable number.

881620409 is a deficient number, since it is larger than the sum of its proper divisors (1).

881620409 is an equidigital number, since it uses as much as digits as its factorization.

881620409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 881620409 is about 29692.0933751731. The cubic root of 881620409 is about 958.8717971107.

The spelling of 881620409 in words is "eight hundred eighty-one million, six hundred twenty thousand, four hundred nine".