1491953550 has 24 divisors (see below), whose sum is σ = 3700045176. Its totient is φ = 397854240.

The previous prime is 1491953531. The next prime is 1491953569. The reversal of 1491953550 is 553591941.

It is an interprime number because it is at equal distance from previous prime (1491953531) and next prime (1491953569).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4973029 + ... + 4973328.

It is an arithmetic number, because the mean of its divisors is an integer number (154168549).

Almost surely, 2^1491953550 is an apocalyptic number.

1491953550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1491953550 is an abundant number, since it is smaller than the sum of its proper divisors (2208091626).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1491953550 is a wasteful number, since it uses less digits than its factorization.

1491953550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9946372 (or 9946367 counting only the distinct ones).

The product of its (nonzero) digits is 121500, while the sum is 42.

The square root of 1491953550 is about 38625.8145545178. The cubic root of 1491953550 is about 1142.6637080730.

The spelling of 1491953550 in words is "one billion, four hundred ninety-one million, nine hundred fifty-three thousand, five hundred fifty".