1553990191 has 8 divisors (see below), whose sum is σ = 1673894880. Its totient is φ = 1434137952.

The previous prime is 1553990171. The next prime is 1553990197. The reversal of 1553990191 is 1910993551.

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

It is not a de Polignac number, because 1553990191 - 2²⁷ = 1419772463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1553990197) 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, 66261 + ... + 86593.

It is an arithmetic number, because the mean of its divisors is an integer number (209236860).

Almost surely, 2^1553990191 is an apocalyptic number.

1553990191 is a deficient number, since it is larger than the sum of its proper divisors (119904689).

1553990191 is a wasteful number, since it uses less digits than its factorization.

1553990191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26225.

The product of its (nonzero) digits is 54675, while the sum is 43.

The square root of 1553990191 is about 39420.6822746639. The cubic root of 1553990191 is about 1158.2867572161.

The spelling of 1553990191 in words is "one billion, five hundred fifty-three million, nine hundred ninety thousand, one hundred ninety-one".