51420101 has 4 divisors (see below), whose sum is σ = 51463104. Its totient is φ = 51377100.

The previous prime is 51420097. The next prime is 51420107. The reversal of 51420101 is 10102415.

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 51420101 - 2² = 51420097 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 (51420107) 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, 19655 + ... + 22116.

It is an arithmetic number, because the mean of its divisors is an integer number (12865776).

Almost surely, 2^51420101 is an apocalyptic number.

It is an amenable number.

51420101 is a deficient number, since it is larger than the sum of its proper divisors (43003).

51420101 is a wasteful number, since it uses less digits than its factorization.

51420101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43002.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 51420101 is about 7170.7810592710. The cubic root of 51420101 is about 371.8584389301.

Adding to 51420101 its reverse (10102415), we get a palindrome (61522516).

The spelling of 51420101 in words is "fifty-one million, four hundred twenty thousand, one hundred one".