1161456421 has 2 divisors, whose sum is σ = 1161456422. Its totient is φ = 1161456420.

The previous prime is 1161456419. The next prime is 1161456449. The reversal of 1161456421 is 1246541611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1083133921 + 78322500 = 32911^2 + 8850^2 .

It is a cyclic number.

It is not a de Polignac number, because 1161456421 - 2¹ = 1161456419 is a prime.

It is a super-3 number, since 3×1161456421³ (a number of 28 digits) contains 333 as substring.

Together with 1161456419, it forms a pair of twin primes.

It is a zygodrome in base 3.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1161456481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580728210 + 580728211.

It is an arithmetic number, because the mean of its divisors is an integer number (580728211).

Almost surely, 2^1161456421 is an apocalyptic number.

It is an amenable number.

1161456421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161456421 is an equidigital number, since it uses as much as digits as its factorization.

1161456421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 31.

The square root of 1161456421 is about 34080.1470213965. The cubic root of 1161456421 is about 1051.1571282755.

The spelling of 1161456421 in words is "one billion, one hundred sixty-one million, four hundred fifty-six thousand, four hundred twenty-one".