1551649056 has 48 divisors (see below), whose sum is σ = 4078317600. Its totient is φ = 516551168.

The previous prime is 1551649039. The next prime is 1551649081. The reversal of 1551649056 is 6509461551.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×1551649056² = 4815229585971382272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1551648999 and 1551649017.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67675 + ... + 87653.

It is an arithmetic number, because the mean of its divisors is an integer number (84964950).

Almost surely, 2^1551649056 is an apocalyptic number.

1551649056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1551649056 is an abundant number, since it is smaller than the sum of its proper divisors (2526668544).

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

1551649056 is a wasteful number, since it uses less digits than its factorization.

1551649056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20801 (or 20793 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 42.

The square root of 1551649056 is about 39390.9768348032. The cubic root of 1551649056 is about 1157.7047997536.

The spelling of 1551649056 in words is "one billion, five hundred fifty-one million, six hundred forty-nine thousand, fifty-six".