400251541 has 2 divisors, whose sum is σ = 400251542. Its totient is φ = 400251540.

The previous prime is 400251499. The next prime is 400251569. The reversal of 400251541 is 145152004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 252142641 + 148108900 = 15879^2 + 12170^2 .

It is a cyclic number.

It is not a de Polignac number, because 400251541 - 2²¹ = 398154389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400251581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200125770 + 200125771.

It is an arithmetic number, because the mean of its divisors is an integer number (200125771).

Almost surely, 2^400251541 is an apocalyptic number.

It is an amenable number.

400251541 is a deficient number, since it is larger than the sum of its proper divisors (1).

400251541 is an equidigital number, since it uses as much as digits as its factorization.

400251541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 400251541 is about 20006.2875366721. The cubic root of 400251541 is about 736.9607148590.

The spelling of 400251541 in words is "four hundred million, two hundred fifty-one thousand, five hundred forty-one".