1161510551 has 4 divisors (see below), whose sum is σ = 1168465872. Its totient is φ = 1154555232.

The previous prime is 1161510547. The next prime is 1161510563. The reversal of 1161510551 is 1550151611.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1161510551 - 2² = 1161510547 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1161510551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161510541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3477410 + ... + 3477743.

It is an arithmetic number, because the mean of its divisors is an integer number (292116468).

Almost surely, 2^1161510551 is an apocalyptic number.

1161510551 is a deficient number, since it is larger than the sum of its proper divisors (6955321).

1161510551 is an equidigital number, since it uses as much as digits as its factorization.

1161510551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6955320.

The product of its (nonzero) digits is 750, while the sum is 26.

The square root of 1161510551 is about 34080.9411695158. The cubic root of 1161510551 is about 1051.1734578454.

The spelling of 1161510551 in words is "one billion, one hundred sixty-one million, five hundred ten thousand, five hundred fifty-one".