61091615 has 8 divisors (see below), whose sum is σ = 78949248. Its totient is φ = 45113760.

The previous prime is 61091581. The next prime is 61091617. The reversal of 61091615 is 51619016.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61091615 - 2¹⁰ = 61090591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61091617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 469871 + ... + 470000.

It is an arithmetic number, because the mean of its divisors is an integer number (9868656).

Almost surely, 2^61091615 is an apocalyptic number.

61091615 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

61091615 is a deficient number, since it is larger than the sum of its proper divisors (17857633).

61091615 is a wasteful number, since it uses less digits than its factorization.

61091615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939889.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 61091615 is about 7816.1125247785. The cubic root of 61091615 is about 393.8466919672.

The spelling of 61091615 in words is "sixty-one million, ninety-one thousand, six hundred fifteen".