251340101 has 2 divisors, whose sum is σ = 251340102. Its totient is φ = 251340100.

The previous prime is 251340097. The next prime is 251340163. The reversal of 251340101 is 101043152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208109476 + 43230625 = 14426^2 + 6575^2 .

It is a cyclic number.

It is not a de Polignac number, because 251340101 - 2² = 251340097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 251340101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251340181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125670050 + 125670051.

It is an arithmetic number, because the mean of its divisors is an integer number (125670051).

Almost surely, 2^251340101 is an apocalyptic number.

It is an amenable number.

251340101 is a deficient number, since it is larger than the sum of its proper divisors (1).

251340101 is an equidigital number, since it uses as much as digits as its factorization.

251340101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 251340101 is about 15853.7093766727. The cubic root of 251340101 is about 631.0841339724.

Adding to 251340101 its reverse (101043152), we get a palindrome (352383253).

The spelling of 251340101 in words is "two hundred fifty-one million, three hundred forty thousand, one hundred one".