1009491550 has 12 divisors (see below), whose sum is σ = 1877654376. Its totient is φ = 403796600.

The previous prime is 1009491541. The next prime is 1009491557. The reversal of 1009491550 is 551949001.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1009491557) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10094866 + ... + 10094965.

It is an arithmetic number, because the mean of its divisors is an integer number (156471198).

Almost surely, 2^1009491550 is an apocalyptic number.

1009491550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1009491550 is a deficient number, since it is larger than the sum of its proper divisors (868162826).

1009491550 is a wasteful number, since it uses less digits than its factorization.

1009491550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20189843 (or 20189838 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 34.

The square root of 1009491550 is about 31772.4967542685. The cubic root of 1009491550 is about 1003.1538925048.

The spelling of 1009491550 in words is "one billion, nine million, four hundred ninety-one thousand, five hundred fifty".