1551121632 has 36 divisors (see below), whose sum is σ = 4411002960. Its totient is φ = 517040448.

The previous prime is 1551121631. The next prime is 1551121657. The reversal of 1551121632 is 2361211551.

1551121632 is a `hidden beast` number, since 1 + 5 + 5 + 1 + 1 + 21 + 632 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 1551121596 and 1551121605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1551121631) 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, 2692632 + ... + 2693207.

It is an arithmetic number, because the mean of its divisors is an integer number (122527860).

Almost surely, 2^1551121632 is an apocalyptic number.

1551121632 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1551121632 is an abundant number, since it is smaller than the sum of its proper divisors (2859881328).

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

1551121632 is a wasteful number, since it uses less digits than its factorization.

1551121632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5385855 (or 5385844 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 1551121632 is about 39384.2815346427. The cubic root of 1551121632 is about 1157.5736123371.

The spelling of 1551121632 in words is "one billion, five hundred fifty-one million, one hundred twenty-one thousand, six hundred thirty-two".