55140731 has 2 divisors, whose sum is σ = 55140732. Its totient is φ = 55140730.

The previous prime is 55140727. The next prime is 55140737. The reversal of 55140731 is 13704155.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55140731 - 2² = 55140727 is a prime.

It is a super-2 number, since 2×55140731² = 6081000430428722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55140731.

It is not a weakly prime, because it can be changed into another prime (55140737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27570365 + 27570366.

It is an arithmetic number, because the mean of its divisors is an integer number (27570366).

Almost surely, 2^55140731 is an apocalyptic number.

55140731 is a deficient number, since it is larger than the sum of its proper divisors (1).

55140731 is an equidigital number, since it uses as much as digits as its factorization.

55140731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 55140731 is about 7425.6805075360. The cubic root of 55140731 is about 380.6193293950.

Adding to 55140731 its reverse (13704155), we get a palindrome (68844886).

The spelling of 55140731 in words is "fifty-five million, one hundred forty thousand, seven hundred thirty-one".