1553021401 has 8 divisors (see below), whose sum is σ = 1563057344. Its totient is φ = 1543011120.

The previous prime is 1553021333. The next prime is 1553021413. The reversal of 1553021401 is 1041203551.

It is a happy number.

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 1553021401 - 2¹¹ = 1553019353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1553021441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123340 + ... + 135346.

It is an arithmetic number, because the mean of its divisors is an integer number (195382168).

Almost surely, 2^1553021401 is an apocalyptic number.

It is an amenable number.

1553021401 is a deficient number, since it is larger than the sum of its proper divisors (10035943).

1553021401 is a wasteful number, since it uses less digits than its factorization.

1553021401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12831.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 1553021401 is about 39408.3925198682. The cubic root of 1553021401 is about 1158.0460071130.

Adding to 1553021401 its reverse (1041203551), we get a palindrome (2594224952).

The spelling of 1553021401 in words is "one billion, five hundred fifty-three million, twenty-one thousand, four hundred one".