5111287561 has 4 divisors (see below), whose sum is σ = 5130288900. Its totient is φ = 5092286224.

The previous prime is 5111287549. The next prime is 5111287583. The reversal of 5111287561 is 1657821115.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1529983225 + 3581304336 = 39115^2 + 59844^2 .

It is a cyclic number.

It is not a de Polignac number, because 5111287561 - 2²³ = 5102898953 is a prime.

It is a super-2 number, since 2×5111287561² = 52250521062466657442, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 5111287561.

It is not an unprimeable number, because it can be changed into a prime (5111267561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9500266 + ... + 9500803.

It is an arithmetic number, because the mean of its divisors is an integer number (1282572225).

Almost surely, 2^5111287561 is an apocalyptic number.

It is an amenable number.

5111287561 is a deficient number, since it is larger than the sum of its proper divisors (19001339).

5111287561 is a wasteful number, since it uses less digits than its factorization.

5111287561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19001338.

The product of its digits is 16800, while the sum is 37.

The square root of 5111287561 is about 71493.2693405470. The cubic root of 5111287561 is about 1722.5695729758.

The spelling of 5111287561 in words is "five billion, one hundred eleven million, two hundred eighty-seven thousand, five hundred sixty-one".