1551015601 has 2 divisors, whose sum is σ = 1551015602. Its totient is φ = 1551015600.

The previous prime is 1551015589. The next prime is 1551015623. The reversal of 1551015601 is 1065101551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1522872576 + 28143025 = 39024^2 + 5305^2 .

It is a cyclic number.

It is not a de Polignac number, because 1551015601 - 2²³ = 1542626993 is a prime.

It is not a weakly prime, because it can be changed into another prime (1551015001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775507800 + 775507801.

It is an arithmetic number, because the mean of its divisors is an integer number (775507801).

Almost surely, 2^1551015601 is an apocalyptic number.

It is an amenable number.

1551015601 is a deficient number, since it is larger than the sum of its proper divisors (1).

1551015601 is an equidigital number, since it uses as much as digits as its factorization.

1551015601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 750, while the sum is 25.

The square root of 1551015601 is about 39382.9354035476. The cubic root of 1551015601 is about 1157.5472354061.

The spelling of 1551015601 in words is "one billion, five hundred fifty-one million, fifteen thousand, six hundred one".