1321787153 has 2 divisors, whose sum is σ = 1321787154. Its totient is φ = 1321787152.

The previous prime is 1321787147. The next prime is 1321787219. The reversal of 1321787153 is 3517871231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 967707664 + 354079489 = 31108^2 + 18817^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321787153 - 2²⁰ = 1320738577 is a prime.

It is not a weakly prime, because it can be changed into another prime (1321787123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660893576 + 660893577.

It is an arithmetic number, because the mean of its divisors is an integer number (660893577).

Almost surely, 2^1321787153 is an apocalyptic number.

It is an amenable number.

1321787153 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321787153 is an equidigital number, since it uses as much as digits as its factorization.

1321787153 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35280, while the sum is 38.

The square root of 1321787153 is about 36356.3908137208. The cubic root of 1321787153 is about 1097.4561472577.

The spelling of 1321787153 in words is "one billion, three hundred twenty-one million, seven hundred eighty-seven thousand, one hundred fifty-three".