2091506440 has 16 divisors (see below), whose sum is σ = 4705889580. Its totient is φ = 836602560.

The previous prime is 2091506401. The next prime is 2091506479. The reversal of 2091506440 is 446051902.

It is an interprime number because it is at equal distance from previous prime (2091506401) and next prime (2091506479).

It can be written as a sum of positive squares in 2 ways, for example, as 2064611844 + 26894596 = 45438^2 + 5186^2 .

It is a super-2 number, since 2×2091506440² = 8748798377122947200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26143791 + ... + 26143870.

Almost surely, 2^2091506440 is an apocalyptic number.

2091506440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2091506440 is an abundant number, since it is smaller than the sum of its proper divisors (2614383140).

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

2091506440 is a wasteful number, since it uses less digits than its factorization.

2091506440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52287672 (or 52287668 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 2091506440 is about 45732.9907178614. The cubic root of 2091506440 is about 1278.8503756585.

The spelling of 2091506440 in words is "two billion, ninety-one million, five hundred six thousand, four hundred forty".