61078009 has 4 divisors (see below), whose sum is σ = 62728804. Its totient is φ = 59427216.

The previous prime is 61078001. The next prime is 61078013. The reversal of 61078009 is 90087016.

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 20793600 + 40284409 = 4560^2 + 6347^2 .

It is a cyclic number.

It is not a de Polignac number, because 61078009 - 2³ = 61078001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61078001) 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, 825342 + ... + 825415.

It is an arithmetic number, because the mean of its divisors is an integer number (15682201).

Almost surely, 2^61078009 is an apocalyptic number.

It is an amenable number.

61078009 is a deficient number, since it is larger than the sum of its proper divisors (1650795).

61078009 is a wasteful number, since it uses less digits than its factorization.

61078009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1650794.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 61078009 is about 7815.2420947786. The cubic root of 61078009 is about 393.8174513152.

The spelling of 61078009 in words is "sixty-one million, seventy-eight thousand, nine".