1553753491 has 2 divisors, whose sum is σ = 1553753492. Its totient is φ = 1553753490.

The previous prime is 1553753479. The next prime is 1553753521. The reversal of 1553753491 is 1943573551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1553753491 - 2¹¹ = 1553751443 is a prime.

It is not a weakly prime, because it can be changed into another prime (1553753791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 776876745 + 776876746.

It is an arithmetic number, because the mean of its divisors is an integer number (776876746).

Almost surely, 2^1553753491 is an apocalyptic number.

1553753491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1553753491 is an equidigital number, since it uses as much as digits as its factorization.

1553753491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 283500, while the sum is 43.

The square root of 1553753491 is about 39417.6799291891. The cubic root of 1553753491 is about 1158.2279450909.

The spelling of 1553753491 in words is "one billion, five hundred fifty-three million, seven hundred fifty-three thousand, four hundred ninety-one".