612581409 has 48 divisors (see below), whose sum is σ = 992818944. Its totient is φ = 360787200.

The previous prime is 612581381. The next prime is 612581423. The reversal of 612581409 is 904185216.

It is not a de Polignac number, because 612581409 - 2²⁴ = 595804193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (612581429) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 804589 + ... + 805349.

It is an arithmetic number, because the mean of its divisors is an integer number (20683728).

Almost surely, 2^612581409 is an apocalyptic number.

It is an amenable number.

612581409 is a deficient number, since it is larger than the sum of its proper divisors (380237535).

612581409 is a wasteful number, since it uses less digits than its factorization.

612581409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 998 (or 995 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 612581409 is about 24750.3819970521. The cubic root of 612581409 is about 849.2872497944.

The spelling of 612581409 in words is "six hundred twelve million, five hundred eighty-one thousand, four hundred nine".