400061251 has 2 divisors, whose sum is σ = 400061252. Its totient is φ = 400061250.

The previous prime is 400061239. The next prime is 400061281. The reversal of 400061251 is 152160004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400061251 - 2¹⁵ = 400028483 is a prime.

It is not a weakly prime, because it can be changed into another prime (400061281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200030625 + 200030626.

It is an arithmetic number, because the mean of its divisors is an integer number (200030626).

Almost surely, 2^400061251 is an apocalyptic number.

400061251 is a deficient number, since it is larger than the sum of its proper divisors (1).

400061251 is an equidigital number, since it uses as much as digits as its factorization.

400061251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 400061251 is about 20001.5312163844. The cubic root of 400061251 is about 736.8439062442.

The spelling of 400061251 in words is "four hundred million, sixty-one thousand, two hundred fifty-one".