401888549 has 2 divisors, whose sum is σ = 401888550. Its totient is φ = 401888548.

The previous prime is 401888537. The next prime is 401888567. The reversal of 401888549 is 945888104.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 399280324 + 2608225 = 19982^2 + 1615^2 .

It is a cyclic number.

It is not a de Polignac number, because 401888549 - 2¹² = 401884453 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401888749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200944274 + 200944275.

It is an arithmetic number, because the mean of its divisors is an integer number (200944275).

Almost surely, 2^401888549 is an apocalyptic number.

It is an amenable number.

401888549 is a deficient number, since it is larger than the sum of its proper divisors (1).

401888549 is an equidigital number, since it uses as much as digits as its factorization.

401888549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 368640, while the sum is 47.

The square root of 401888549 is about 20047.1581277746. The cubic root of 401888549 is about 737.9640585655.

The spelling of 401888549 in words is "four hundred one million, eight hundred eighty-eight thousand, five hundred forty-nine".