51421001 has 2 divisors, whose sum is σ = 51421002. Its totient is φ = 51421000.

The previous prime is 51420997. The next prime is 51421043. The reversal of 51421001 is 10012415.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30261001 + 21160000 = 5501^2 + 4600^2 .

It is a cyclic number.

It is not a de Polignac number, because 51421001 - 2² = 51420997 is a prime.

It is not a weakly prime, because it can be changed into another prime (51421061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25710500 + 25710501.

It is an arithmetic number, because the mean of its divisors is an integer number (25710501).

Almost surely, 2^51421001 is an apocalyptic number.

It is an amenable number.

51421001 is a deficient number, since it is larger than the sum of its proper divisors (1).

51421001 is an equidigital number, since it uses as much as digits as its factorization.

51421001 is an evil number, because the sum of its binary digits is even.

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

The square root of 51421001 is about 7170.8438136666. The cubic root of 51421001 is about 371.8606084490.

Adding to 51421001 its reverse (10012415), we get a palindrome (61433416).

The spelling of 51421001 in words is "fifty-one million, four hundred twenty-one thousand, one".