1171361621 has 16 divisors (see below), whose sum is σ = 1206350208. Its totient is φ = 1137024000.

The previous prime is 1171361593. The next prime is 1171361627. The reversal of 1171361621 is 1261631711.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1171361621 - 2¹⁸ = 1171099477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1171361627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1948721 + ... + 1949321.

It is an arithmetic number, because the mean of its divisors is an integer number (75396888).

Almost surely, 2^1171361621 is an apocalyptic number.

It is an amenable number.

1171361621 is a deficient number, since it is larger than the sum of its proper divisors (34988587).

1171361621 is an equidigital number, since it uses as much as digits as its factorization.

1171361621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052.

The product of its digits is 1512, while the sum is 29.

The square root of 1171361621 is about 34225.1606424280. The cubic root of 1171361621 is about 1054.1368533645.

The spelling of 1171361621 in words is "one billion, one hundred seventy-one million, three hundred sixty-one thousand, six hundred twenty-one".