1161890451 has 24 divisors (see below), whose sum is σ = 1771770000. Its totient is φ = 731685312.

The previous prime is 1161890441. The next prime is 1161890453. The reversal of 1161890451 is 1540981611.

It is a happy number.

1161890451 is a `hidden beast` number, since 116 + 1 + 8 + 90 + 451 = 666.

It is not a de Polignac number, because 1161890451 - 2¹⁰ = 1161889427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1161890453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49945 + ... + 69413.

It is an arithmetic number, because the mean of its divisors is an integer number (73823750).

Almost surely, 2^1161890451 is an apocalyptic number.

1161890451 is a deficient number, since it is larger than the sum of its proper divisors (609879549).

1161890451 is a wasteful number, since it uses less digits than its factorization.

1161890451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19843 (or 19840 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 36.

The square root of 1161890451 is about 34086.5142101682. The cubic root of 1161890451 is about 1051.2880492185.

The spelling of 1161890451 in words is "one billion, one hundred sixty-one million, eight hundred ninety thousand, four hundred fifty-one".