51011151091 has 4 divisors (see below), whose sum is σ = 51011614512. Its totient is φ = 51010687672.

The previous prime is 51011151073. The next prime is 51011151101. The reversal of 51011151091 is 19015111015.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 51011151091 - 2¹¹ = 51011149043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51011151491) 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, 38226 + ... + 321688.

It is an arithmetic number, because the mean of its divisors is an integer number (12752903628).

Almost surely, 2^51011151091 is an apocalyptic number.

51011151091 is a deficient number, since it is larger than the sum of its proper divisors (463421).

51011151091 is a wasteful number, since it uses less digits than its factorization.

51011151091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463420.

The product of its (nonzero) digits is 225, while the sum is 25.

The spelling of 51011151091 in words is "fifty-one billion, eleven million, one hundred fifty-one thousand, ninety-one".