609987481 has 4 divisors (see below), whose sum is σ = 610110052. Its totient is φ = 609864912.

The previous prime is 609987473. The next prime is 609987487. The reversal of 609987481 is 184789906.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 318943881 + 291043600 = 17859^2 + 17060^2 .

It is a cyclic number.

It is not a de Polignac number, because 609987481 - 2³ = 609987473 is a prime.

It is a super-2 number, since 2×609987481² = 744169453953450722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (609987487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53490 + ... + 63883.

It is an arithmetic number, because the mean of its divisors is an integer number (152527513).

Almost surely, 2^609987481 is an apocalyptic number.

It is an amenable number.

609987481 is a deficient number, since it is larger than the sum of its proper divisors (122571).

609987481 is a wasteful number, since it uses less digits than its factorization.

609987481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122570.

The product of its (nonzero) digits is 870912, while the sum is 52.

The square root of 609987481 is about 24697.9246294097. The cubic root of 609987481 is about 848.0868070215.

The spelling of 609987481 in words is "six hundred nine million, nine hundred eighty-seven thousand, four hundred eighty-one".