1156491000 has 512 divisors, whose sum is σ = 4762368000. Its totient is φ = 254016000.

The previous prime is 1156490963. The next prime is 1156491023. The reversal of 1156491000 is 1946511.

1156491000 is a `hidden beast` number, since 1 + 1 + 5 + 649 + 10 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 5480895 + ... + 5481105.

It is an arithmetic number, because the mean of its divisors is an integer number (9301500).

Almost surely, 2^1156491000 is an apocalyptic number.

1156491000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1156491000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2381184000).

1156491000 is an abundant number, since it is smaller than the sum of its proper divisors (3605877000).

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

1156491000 is a wasteful number, since it uses less digits than its factorization.

1156491000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277 (or 257 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 1156491000 is about 34007.2198216790. The cubic root of 1156491000 is about 1049.6570308428.

The spelling of 1156491000 in words is "one billion, one hundred fifty-six million, four hundred ninety-one thousand".