1151555421 has 8 divisors (see below), whose sum is σ = 1602164160. Its totient is φ = 734325152.

The previous prime is 1151555407. The next prime is 1151555443. The reversal of 1151555421 is 1245551511.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1151555421 - 2⁵ = 1151555389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1151553421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8344536 + ... + 8344673.

It is an arithmetic number, because the mean of its divisors is an integer number (200270520).

Almost surely, 2^1151555421 is an apocalyptic number.

It is an amenable number.

1151555421 is a deficient number, since it is larger than the sum of its proper divisors (450608739).

1151555421 is a wasteful number, since it uses less digits than its factorization.

1151555421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16689235.

The product of its digits is 5000, while the sum is 30.

The square root of 1151555421 is about 33934.5755977587. The cubic root of 1151555421 is about 1048.1616877180.

The spelling of 1151555421 in words is "one billion, one hundred fifty-one million, five hundred fifty-five thousand, four hundred twenty-one".