401240251 has 2 divisors, whose sum is σ = 401240252. Its totient is φ = 401240250.

The previous prime is 401240243. The next prime is 401240303. The reversal of 401240251 is 152042104.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 401240251 - 2³ = 401240243 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (401243251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200620125 + 200620126.

It is an arithmetic number, because the mean of its divisors is an integer number (200620126).

Almost surely, 2^401240251 is an apocalyptic number.

401240251 is a deficient number, since it is larger than the sum of its proper divisors (1).

401240251 is an equidigital number, since it uses as much as digits as its factorization.

401240251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 401240251 is about 20030.9822774621. The cubic root of 401240251 is about 737.5670346422.

Adding to 401240251 its reverse (152042104), we get a palindrome (553282355).

The spelling of 401240251 in words is "four hundred one million, two hundred forty thousand, two hundred fifty-one".