401544553 has 2 divisors, whose sum is σ = 401544554. Its totient is φ = 401544552.

The previous prime is 401544551. The next prime is 401544569. The reversal of 401544553 is 355445104.

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., 388562944 + 12981609 = 19712^2 + 3603^2 .

It is a cyclic number.

It is not a de Polignac number, because 401544553 - 2¹ = 401544551 is a prime.

It is a super-2 number, since 2×401544553² = 322476056087939618, which contains 22 as substring.

Together with 401544551, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (401544551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200772276 + 200772277.

It is an arithmetic number, because the mean of its divisors is an integer number (200772277).

Almost surely, 2^401544553 is an apocalyptic number.

It is an amenable number.

401544553 is a deficient number, since it is larger than the sum of its proper divisors (1).

401544553 is an equidigital number, since it uses as much as digits as its factorization.

401544553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24000, while the sum is 31.

The square root of 401544553 is about 20038.5766211076. The cubic root of 401544553 is about 737.7534453256.

Adding to 401544553 its reverse (355445104), we get a palindrome (756989657).

The spelling of 401544553 in words is "four hundred one million, five hundred forty-four thousand, five hundred fifty-three".