51183220901 has 4 divisors (see below), whose sum is σ = 51224800704. Its totient is φ = 51141641100.

The previous prime is 51183220877. The next prime is 51183220919. The reversal of 51183220901 is 10902238115.

It is a happy number.

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 51183220901 - 2¹⁴ = 51183204517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51183220981) 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, 20788055 + ... + 20790516.

It is an arithmetic number, because the mean of its divisors is an integer number (12806200176).

Almost surely, 2^51183220901 is an apocalyptic number.

It is an amenable number.

51183220901 is a deficient number, since it is larger than the sum of its proper divisors (41579803).

51183220901 is a wasteful number, since it uses less digits than its factorization.

51183220901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41579802.

The product of its (nonzero) digits is 4320, while the sum is 32.

The spelling of 51183220901 in words is "fifty-one billion, one hundred eighty-three million, two hundred twenty thousand, nine hundred one".