61400015 has 4 divisors (see below), whose sum is σ = 73680024. Its totient is φ = 49120008.

The previous prime is 61400011. The next prime is 61400033. The reversal of 61400015 is 51000416.

It is a happy number.

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 61400015 - 2² = 61400011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61399966 and 61400002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61400011) 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, 6139997 + ... + 6140006.

It is an arithmetic number, because the mean of its divisors is an integer number (18420006).

Almost surely, 2^61400015 is an apocalyptic number.

61400015 is a deficient number, since it is larger than the sum of its proper divisors (12280009).

61400015 is a wasteful number, since it uses less digits than its factorization.

61400015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12280008.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 61400015 is about 7835.8161668074. The cubic root of 61400015 is about 394.5083130651.

The spelling of 61400015 in words is "sixty-one million, four hundred thousand, fifteen".