2491556000 has 48 divisors (see below), whose sum is σ = 6121762920. Its totient is φ = 996620800.

The previous prime is 2491555993. The next prime is 2491556003. The reversal of 2491556000 is 6551942.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 462594064 + 2028961936 = 21508^2 + 45044^2 .

It is a super-2 number, since 2×2491556000² = 12415702602272000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2491556003) 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, 307445 + ... + 315444.

Almost surely, 2^2491556000 is an apocalyptic number.

2491556000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2491556000 is an abundant number, since it is smaller than the sum of its proper divisors (3630206920).

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

2491556000 is an equidigital number, since it uses as much as digits as its factorization.

2491556000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622914 (or 622896 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 2491556000 is about 49915.4885781958. The cubic root of 2491556000 is about 1355.6790485401.

The spelling of 2491556000 in words is "two billion, four hundred ninety-one million, five hundred fifty-six thousand".