146561409 has 6 divisors (see below), whose sum is σ = 211699826. Its totient is φ = 97707600.

The previous prime is 146561381. The next prime is 146561411. The reversal of 146561409 is 904165641.

It can be written as a sum of positive squares in only one way, i.e., 81000000 + 65561409 = 9000^2 + 8097^2 .

It is not a de Polignac number, because 146561409 - 2¹⁶ = 146495873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (146561419) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8142292 + ... + 8142309.

Almost surely, 2^146561409 is an apocalyptic number.

It is an amenable number.

146561409 is a deficient number, since it is larger than the sum of its proper divisors (65138417).

146561409 is a wasteful number, since it uses less digits than its factorization.

146561409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16284607 (or 16284604 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 146561409 is about 12106.2549535354. The cubic root of 146561409 is about 527.2378056530.

The spelling of 146561409 in words is "one hundred forty-six million, five hundred sixty-one thousand, four hundred nine".