1321400149 has 2 divisors, whose sum is σ = 1321400150. Its totient is φ = 1321400148.

The previous prime is 1321400147. The next prime is 1321400161. The reversal of 1321400149 is 9410041231.

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., 1114558225 + 206841924 = 33385^2 + 14382^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321400149 - 2¹ = 1321400147 is a prime.

Together with 1321400147, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321400147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660700074 + 660700075.

It is an arithmetic number, because the mean of its divisors is an integer number (660700075).

Almost surely, 2^1321400149 is an apocalyptic number.

It is an amenable number.

1321400149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321400149 is an equidigital number, since it uses as much as digits as its factorization.

1321400149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1321400149 is about 36351.0680585867. The cubic root of 1321400149 is about 1097.3490293112.

The spelling of 1321400149 in words is "one billion, three hundred twenty-one million, four hundred thousand, one hundred forty-nine".