51451801 has 4 divisors (see below), whose sum is σ = 51563392. Its totient is φ = 51340212.

The previous prime is 51451781. The next prime is 51451811. The reversal of 51451801 is 10815415.

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 51451801 - 2⁵ = 51451769 is a prime.

It is a super-2 number, since 2×51451801² = 5294575652287202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51451811) 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, 55101 + ... + 56026.

It is an arithmetic number, because the mean of its divisors is an integer number (12890848).

Almost surely, 2^51451801 is an apocalyptic number.

It is an amenable number.

51451801 is a deficient number, since it is larger than the sum of its proper divisors (111591).

51451801 is a wasteful number, since it uses less digits than its factorization.

51451801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111590.

The product of its (nonzero) digits is 800, while the sum is 25.

The square root of 51451801 is about 7172.9910776468. The cubic root of 51451801 is about 371.9348389548.

The spelling of 51451801 in words is "fifty-one million, four hundred fifty-one thousand, eight hundred one".