1553162491 has 4 divisors (see below), whose sum is σ = 1553256000. Its totient is φ = 1553068984.

The previous prime is 1553162453. The next prime is 1553162503. The reversal of 1553162491 is 1942613551.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1942613551 = 613 ⋅3169027.

It is a cyclic number.

It is not a de Polignac number, because 1553162491 - 2²¹ = 1551065339 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1553162491.

It is not an unprimeable number, because it can be changed into a prime (1553162411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14356 + ... + 57553.

It is an arithmetic number, because the mean of its divisors is an integer number (388314000).

Almost surely, 2^1553162491 is an apocalyptic number.

1553162491 is a deficient number, since it is larger than the sum of its proper divisors (93509).

1553162491 is an equidigital number, since it uses as much as digits as its factorization.

1553162491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93508.

The product of its digits is 32400, while the sum is 37.

The square root of 1553162491 is about 39410.1825801404. The cubic root of 1553162491 is about 1158.0810750486.

The spelling of 1553162491 in words is "one billion, five hundred fifty-three million, one hundred sixty-two thousand, four hundred ninety-one".