1551515201 has 2 divisors, whose sum is σ = 1551515202. Its totient is φ = 1551515200.

The previous prime is 1551515177. The next prime is 1551515233. The reversal of 1551515201 is 1025151551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1263873601 + 287641600 = 35551^2 + 16960^2 .

It is a cyclic number.

It is not a de Polignac number, because 1551515201 - 2²⁶ = 1484406337 is a prime.

It is not a weakly prime, because it can be changed into another prime (1551515401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775757600 + 775757601.

It is an arithmetic number, because the mean of its divisors is an integer number (775757601).

Almost surely, 2^1551515201 is an apocalyptic number.

It is an amenable number.

1551515201 is a deficient number, since it is larger than the sum of its proper divisors (1).

1551515201 is an equidigital number, since it uses as much as digits as its factorization.

1551515201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1250, while the sum is 26.

The square root of 1551515201 is about 39389.2777415377. The cubic root of 1551515201 is about 1157.6715084988.

Adding to 1551515201 its reverse (1025151551), we get a palindrome (2576666752).

The spelling of 1551515201 in words is "one billion, five hundred fifty-one million, five hundred fifteen thousand, two hundred one".