61509395 has 4 divisors (see below), whose sum is σ = 73811280. Its totient is φ = 49207512.

The previous prime is 61509367. The next prime is 61509407. The reversal of 61509395 is 59390516.

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

It is a cyclic number.

It is not a de Polignac number, because 61509395 - 2⁸ = 61509139 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6150935 + ... + 6150944.

It is an arithmetic number, because the mean of its divisors is an integer number (18452820).

Almost surely, 2^61509395 is an apocalyptic number.

61509395 is a deficient number, since it is larger than the sum of its proper divisors (12301885).

61509395 is a wasteful number, since it uses less digits than its factorization.

61509395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12301884.

The product of its (nonzero) digits is 36450, while the sum is 38.

The square root of 61509395 is about 7842.7925511262. The cubic root of 61509395 is about 394.7424374427.

The spelling of 61509395 in words is "sixty-one million, five hundred nine thousand, three hundred ninety-five".