1401553421 has 2 divisors, whose sum is σ = 1401553422. Its totient is φ = 1401553420.

The previous prime is 1401553357. The next prime is 1401553427. The reversal of 1401553421 is 1243551041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1263020521 + 138532900 = 35539^2 + 11770^2 .

It is a cyclic number.

It is not a de Polignac number, because 1401553421 - 2⁶ = 1401553357 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 (1401553427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 700776710 + 700776711.

It is an arithmetic number, because the mean of its divisors is an integer number (700776711).

Almost surely, 2^1401553421 is an apocalyptic number.

It is an amenable number.

1401553421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1401553421 is an equidigital number, since it uses as much as digits as its factorization.

1401553421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 1401553421 is about 37437.3265738888. The cubic root of 1401553421 is about 1119.1025498306.

The spelling of 1401553421 in words is "one billion, four hundred one million, five hundred fifty-three thousand, four hundred twenty-one".