51511025401 has 4 divisors (see below), whose sum is σ = 56193845904. Its totient is φ = 46828204900.

The previous prime is 51511025399. The next prime is 51511025413. The reversal of 51511025401 is 10452011515.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51511025401 - 2¹ = 51511025399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51511025701) 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, 2341410235 + ... + 2341410256.

It is an arithmetic number, because the mean of its divisors is an integer number (14048461476).

Almost surely, 2^51511025401 is an apocalyptic number.

It is an amenable number.

51511025401 is a deficient number, since it is larger than the sum of its proper divisors (4682820503).

51511025401 is a wasteful number, since it uses less digits than its factorization.

51511025401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4682820502.

The product of its (nonzero) digits is 1000, while the sum is 25.

Adding to 51511025401 its reverse (10452011515), we get a palindrome (61963036916).

The spelling of 51511025401 in words is "fifty-one billion, five hundred eleven million, twenty-five thousand, four hundred one".