55015731 has 24 divisors (see below), whose sum is σ = 82432896. Its totient is φ = 35320320.

The previous prime is 55015729. The next prime is 55015759. The reversal of 55015731 is 13751055.

It is not a de Polignac number, because 55015731 - 2¹ = 55015729 is a prime.

It is a super-2 number, since 2×55015731² = 6053461314928722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55015695 and 55015704.

It is not an unprimeable number, because it can be changed into a prime (55015711) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 81411 + ... + 82083.

It is an arithmetic number, because the mean of its divisors is an integer number (3434704).

Almost surely, 2^55015731 is an apocalyptic number.

55015731 is a deficient number, since it is larger than the sum of its proper divisors (27417165).

55015731 is a wasteful number, since it uses less digits than its factorization.

55015731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1003 (or 1000 counting only the distinct ones).

The product of its (nonzero) digits is 2625, while the sum is 27.

The square root of 55015731 is about 7417.2589950736. The cubic root of 55015731 is about 380.3314997382.

Adding to 55015731 its reverse (13751055), we get a palindrome (68766786).

The spelling of 55015731 in words is "fifty-five million, fifteen thousand, seven hundred thirty-one".