51219001 has 4 divisors (see below), whose sum is σ = 51533392. Its totient is φ = 50904612.

The previous prime is 51218983. The next prime is 51219013. The reversal of 51219001 is 10091215.

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 51219001 - 2⁵ = 51218969 is a prime.

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 51219001.

It is not an unprimeable number, because it can be changed into a prime (51219031) 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, 156951 + ... + 157276.

It is an arithmetic number, because the mean of its divisors is an integer number (12883348).

Almost surely, 2^51219001 is an apocalyptic number.

It is an amenable number.

51219001 is a deficient number, since it is larger than the sum of its proper divisors (314391).

51219001 is a wasteful number, since it uses less digits than its factorization.

51219001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314390.

The product of its (nonzero) digits is 90, while the sum is 19.

The square root of 51219001 is about 7156.7451400759. The cubic root of 51219001 is about 371.3730358148.

The spelling of 51219001 in words is "fifty-one million, two hundred nineteen thousand, one".