2861620409 has 2 divisors, whose sum is σ = 2861620410. Its totient is φ = 2861620408.

The previous prime is 2861620393. The next prime is 2861620429. The reversal of 2861620409 is 9040261682.

2861620409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2572518400 + 289102009 = 50720^2 + 17003^2 .

It is a cyclic number.

It is not a de Polignac number, because 2861620409 - 2⁴ = 2861620393 is a prime.

It is not a weakly prime, because it can be changed into another prime (2861620429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1430810204 + 1430810205.

It is an arithmetic number, because the mean of its divisors is an integer number (1430810205).

Almost surely, 2^2861620409 is an apocalyptic number.

It is an amenable number.

2861620409 is a deficient number, since it is larger than the sum of its proper divisors (1).

2861620409 is an equidigital number, since it uses as much as digits as its factorization.

2861620409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 2861620409 is about 53494.1156483589. The cubic root of 2861620409 is about 1419.7242751369.

The spelling of 2861620409 in words is "two billion, eight hundred sixty-one million, six hundred twenty thousand, four hundred nine".