1553404551 has 4 divisors (see below), whose sum is σ = 2071206072. Its totient is φ = 1035603032.

The previous prime is 1553404549. The next prime is 1553404553. The reversal of 1553404551 is 1554043551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1554043551 = 3 ⋅518014517.

It is an interprime number because it is at equal distance from previous prime (1553404549) and next prime (1553404553).

It is a cyclic number.

It is not a de Polignac number, because 1553404551 - 2¹ = 1553404549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1553404553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 258900756 + ... + 258900761.

It is an arithmetic number, because the mean of its divisors is an integer number (517801518).

Almost surely, 2^1553404551 is an apocalyptic number.

1553404551 is a deficient number, since it is larger than the sum of its proper divisors (517801521).

1553404551 is an equidigital number, since it uses as much as digits as its factorization.

1553404551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517801520.

The product of its (nonzero) digits is 30000, while the sum is 33.

The square root of 1553404551 is about 39413.2534942245. The cubic root of 1553404551 is about 1158.1412341423.

The spelling of 1553404551 in words is "one billion, five hundred fifty-three million, four hundred four thousand, five hundred fifty-one".