55015597 has 16 divisors (see below), whose sum is σ = 68145280. Its totient is φ = 43250112.

The previous prime is 55015591. The next prime is 55015603. The reversal of 55015597 is 79551055.

It is an interprime number because it is at equal distance from previous prime (55015591) and next prime (55015603).

It is a 4-Lehmer number, since φ(55015597) divides (55015597-1)⁴.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55015597 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55015591) 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, 12979 + ... + 16687.

It is an arithmetic number, because the mean of its divisors is an integer number (4259080).

Almost surely, 2^55015597 is an apocalyptic number.

55015597 is the 3709-th decagonal number.

It is an amenable number.

55015597 is a deficient number, since it is larger than the sum of its proper divisors (13129683).

55015597 is a wasteful number, since it uses less digits than its factorization.

55015597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3892.

The product of its (nonzero) digits is 39375, while the sum is 37.

The square root of 55015597 is about 7417.2499620816. The cubic root of 55015597 is about 380.3311909510.

The spelling of 55015597 in words is "fifty-five million, fifteen thousand, five hundred ninety-seven".