1391149553 has 2 divisors, whose sum is σ = 1391149554. Its totient is φ = 1391149552.

The previous prime is 1391149541. The next prime is 1391149577. The reversal of 1391149553 is 3559411931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1379973904 + 11175649 = 37148^2 + 3343^2 .

It is a cyclic number.

It is not a de Polignac number, because 1391149553 - 2⁴ = 1391149537 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1391149553.

It is not a weakly prime, because it can be changed into another prime (1391149523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695574776 + 695574777.

It is an arithmetic number, because the mean of its divisors is an integer number (695574777).

Almost surely, 2^1391149553 is an apocalyptic number.

It is an amenable number.

1391149553 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391149553 is an equidigital number, since it uses as much as digits as its factorization.

1391149553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72900, while the sum is 41.

The square root of 1391149553 is about 37298.1172849247. The cubic root of 1391149553 is about 1116.3266005492.

The spelling of 1391149553 in words is "one billion, three hundred ninety-one million, one hundred forty-nine thousand, five hundred fifty-three".