1550561651 has 2 divisors, whose sum is σ = 1550561652. Its totient is φ = 1550561650.

The previous prime is 1550561611. The next prime is 1550561681. The reversal of 1550561651 is 1561650551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1550561651 - 2¹⁴ = 1550545267 is a prime.

It is not a weakly prime, because it can be changed into another prime (1550561611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775280825 + 775280826.

It is an arithmetic number, because the mean of its divisors is an integer number (775280826).

Almost surely, 2^1550561651 is an apocalyptic number.

1550561651 is a deficient number, since it is larger than the sum of its proper divisors (1).

1550561651 is an equidigital number, since it uses as much as digits as its factorization.

1550561651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22500, while the sum is 35.

The square root of 1550561651 is about 39377.1716988409. The cubic root of 1550561651 is about 1157.4342943886.

Subtracting 1550561651 from its reverse (1561650551), we obtain a square (11088900 = 3330²).

The spelling of 1550561651 in words is "one billion, five hundred fifty million, five hundred sixty-one thousand, six hundred fifty-one".