1551011601 has 12 divisors (see below), whose sum is σ = 2161840688. Its totient is φ = 989049864.

The previous prime is 1551011599. The next prime is 1551011639. The reversal of 1551011601 is 1061101551.

It is a happy number.

It is not a de Polignac number, because 1551011601 - 2¹ = 1551011599 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1551015601) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 487075 + ... + 490248.

Almost surely, 2^1551011601 is an apocalyptic number.

It is an amenable number.

1551011601 is a deficient number, since it is larger than the sum of its proper divisors (610829087).

1551011601 is an equidigital number, since it uses as much as digits as its factorization.

1551011601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977372 (or 977349 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 21.

The square root of 1551011601 is about 39382.8846200986. The cubic root of 1551011601 is about 1157.5462403177.

The spelling of 1551011601 in words is "one billion, five hundred fifty-one million, eleven thousand, six hundred one".