56503311 has 16 divisors (see below), whose sum is σ = 77193600. Its totient is φ = 36751968.

The previous prime is 56503309. The next prime is 56503327. The reversal of 56503311 is 11330565.

It is not a de Polignac number, because 56503311 - 2¹ = 56503309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56503411) 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, 20620 + ... + 23198.

It is an arithmetic number, because the mean of its divisors is an integer number (4824600).

Almost surely, 2^56503311 is an apocalyptic number.

56503311 is a deficient number, since it is larger than the sum of its proper divisors (20690289).

56503311 is a wasteful number, since it uses less digits than its factorization.

56503311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2758.

The product of its (nonzero) digits is 1350, while the sum is 24.

The square root of 56503311 is about 7516.8684304037. The cubic root of 56503311 is about 383.7290093807.

Adding to 56503311 its reverse (11330565), we get a palindrome (67833876).

The spelling of 56503311 in words is "fifty-six million, five hundred three thousand, three hundred eleven".