1553621061 has 8 divisors (see below), whose sum is σ = 2090854944. Its totient is φ = 1026067280.

The previous prime is 1553621057. The next prime is 1553621071. The reversal of 1553621061 is 1601263551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1553621061 - 2² = 1553621057 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1553621021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2419650 + ... + 2420291.

It is an arithmetic number, because the mean of its divisors is an integer number (261356868).

Almost surely, 2^1553621061 is an apocalyptic number.

It is an amenable number.

1553621061 is a deficient number, since it is larger than the sum of its proper divisors (537233883).

1553621061 is a wasteful number, since it uses less digits than its factorization.

1553621061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4840051.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 1553621061 is about 39416.0000634260. Note that the first 4 decimals coincide. The cubic root of 1553621061 is about 1158.1950380080.

The spelling of 1553621061 in words is "one billion, five hundred fifty-three million, six hundred twenty-one thousand, sixty-one".