2135251409 has 2 divisors, whose sum is σ = 2135251410. Its totient is φ = 2135251408.

The previous prime is 2135251367. The next prime is 2135251507. The reversal of 2135251409 is 9041525312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1242915025 + 892336384 = 35255^2 + 29872^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2135251409 is a prime.

It is not a weakly prime, because it can be changed into another prime (2135251109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1067625704 + 1067625705.

It is an arithmetic number, because the mean of its divisors is an integer number (1067625705).

Almost surely, 2^2135251409 is an apocalyptic number.

It is an amenable number.

2135251409 is a deficient number, since it is larger than the sum of its proper divisors (1).

2135251409 is an equidigital number, since it uses as much as digits as its factorization.

2135251409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 2135251409 is about 46208.7806482707. The cubic root of 2135251409 is about 1287.7048725918.

The spelling of 2135251409 in words is "two billion, one hundred thirty-five million, two hundred fifty-one thousand, four hundred nine".