1151361621 has 20 divisors (see below), whose sum is σ = 1743504972. Its totient is φ = 757055808.

The previous prime is 1151361613. The next prime is 1151361637. The reversal of 1151361621 is 1261631511.

1151361621 is a `hidden beast` number, since 1 + 1 + 5 + 1 + 36 + 1 + 621 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 448846596 + 702515025 = 21186^2 + 26505^2 .

It is not a de Polignac number, because 1151361621 - 2³ = 1151361613 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1151361691) 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 19 ways as a sum of consecutive naturals, for example, 91446 + ... + 103271.

Almost surely, 2^1151361621 is an apocalyptic number.

It is an amenable number.

1151361621 is a deficient number, since it is larger than the sum of its proper divisors (592143351).

1151361621 is an equidigital number, since it uses as much as digits as its factorization.

1151361621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194802 (or 194793 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 1151361621 is about 33931.7199829304. The cubic root of 1151361621 is about 1048.1028846048.

The spelling of 1151361621 in words is "one billion, one hundred fifty-one million, three hundred sixty-one thousand, six hundred twenty-one".