1161356421 has 16 divisors (see below), whose sum is σ = 1556640000. Its totient is φ = 770165760.

The previous prime is 1161356419. The next prime is 1161356423. The reversal of 1161356421 is 1246531611.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1161356419) and next prime (1161356423).

It is not a de Polignac number, because 1161356421 - 2¹ = 1161356419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161356423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 929205 + ... + 930453.

It is an arithmetic number, because the mean of its divisors is an integer number (97290000).

Almost surely, 2^1161356421 is an apocalyptic number.

It is an amenable number.

1161356421 is a deficient number, since it is larger than the sum of its proper divisors (395283579).

1161356421 is a wasteful number, since it uses less digits than its factorization.

1161356421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2636.

The product of its digits is 4320, while the sum is 30.

The square root of 1161356421 is about 34078.6798599946. The cubic root of 1161356421 is about 1051.1269596218.

The spelling of 1161356421 in words is "one billion, one hundred sixty-one million, three hundred fifty-six thousand, four hundred twenty-one".