1161510421 has 4 divisors (see below), whose sum is σ = 1161581292. Its totient is φ = 1161439552.

The previous prime is 1161510379. The next prime is 1161510433. The reversal of 1161510421 is 1240151611.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1240151611 = 53 ⋅23399087.

It can be written as a sum of positive squares in 2 ways, for example, as 114276100 + 1047234321 = 10690^2 + 32361^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1161510421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1161510392 and 1161510401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161510461) 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, 3165 + ... + 48301.

It is an arithmetic number, because the mean of its divisors is an integer number (290395323).

Almost surely, 2^1161510421 is an apocalyptic number.

It is an amenable number.

1161510421 is a deficient number, since it is larger than the sum of its proper divisors (70871).

1161510421 is an equidigital number, since it uses as much as digits as its factorization.

1161510421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70870.

The product of its (nonzero) digits is 240, while the sum is 22.

The square root of 1161510421 is about 34080.9392622915. The cubic root of 1161510421 is about 1051.1734186285.

The spelling of 1161510421 in words is "one billion, one hundred sixty-one million, five hundred ten thousand, four hundred twenty-one".