61098509 has 4 divisors (see below), whose sum is σ = 64314240. Its totient is φ = 57882780.

The previous prime is 61098481. The next prime is 61098517. The reversal of 61098509 is 90589016.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61098509 - 2⁸ = 61098253 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61098529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1607837 + ... + 1607874.

It is an arithmetic number, because the mean of its divisors is an integer number (16078560).

Almost surely, 2^61098509 is an apocalyptic number.

It is an amenable number.

61098509 is a deficient number, since it is larger than the sum of its proper divisors (3215731).

61098509 is a wasteful number, since it uses less digits than its factorization.

61098509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3215730.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 61098509 is about 7816.5535244121. The cubic root of 61098509 is about 393.8615062040.

The spelling of 61098509 in words is "sixty-one million, ninety-eight thousand, five hundred nine".