1205135651 has 2 divisors, whose sum is σ = 1205135652. Its totient is φ = 1205135650.

The previous prime is 1205135641. The next prime is 1205135671. The reversal of 1205135651 is 1565315021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1205135651 - 2¹⁰ = 1205134627 is a prime.

It is a super-2 number, since 2×1205135651² = 2904703874622387602, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1205135641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602567825 + 602567826.

It is an arithmetic number, because the mean of its divisors is an integer number (602567826).

Almost surely, 2^1205135651 is an apocalyptic number.

1205135651 is a deficient number, since it is larger than the sum of its proper divisors (1).

1205135651 is an equidigital number, since it uses as much as digits as its factorization.

1205135651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 1205135651 is about 34715.0637476010. The cubic root of 1205135651 is about 1064.1723682320.

The spelling of 1205135651 in words is "one billion, two hundred five million, one hundred thirty-five thousand, six hundred fifty-one".