61415409 has 16 divisors (see below), whose sum is σ = 89496000. Its totient is φ = 37152960.

The previous prime is 61415399. The next prime is 61415413. The reversal of 61415409 is 90451416.

It is a happy number.

It is not a de Polignac number, because 61415409 - 2¹² = 61411313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61411409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20967 + ... + 23715.

It is an arithmetic number, because the mean of its divisors is an integer number (5593500).

Almost surely, 2^61415409 is an apocalyptic number.

It is an amenable number.

61415409 is a deficient number, since it is larger than the sum of its proper divisors (28080591).

61415409 is a wasteful number, since it uses less digits than its factorization.

61415409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3440.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 61415409 is about 7836.7983896487. The cubic root of 61415409 is about 394.5412802314.

The spelling of 61415409 in words is "sixty-one million, four hundred fifteen thousand, four hundred nine".