1151531421 has 8 divisors (see below), whose sum is σ = 1535587680. Its totient is φ = 767581392.

The previous prime is 1151531399. The next prime is 1151531429. The reversal of 1151531421 is 1241351511.

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

It is not a de Polignac number, because 1151531421 - 2¹⁴ = 1151515037 is a prime.

It is a super-2 number, since 2×1151531421² = 2652049227100558482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1151531391 and 1151531400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1151531429) 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, 3646 + ... + 48128.

It is an arithmetic number, because the mean of its divisors is an integer number (191948460).

Almost surely, 2^1151531421 is an apocalyptic number.

It is an amenable number.

1151531421 is a deficient number, since it is larger than the sum of its proper divisors (384056259).

1151531421 is an equidigital number, since it uses as much as digits as its factorization.

1151531421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53115.

The product of its digits is 600, while the sum is 24.

The square root of 1151531421 is about 33934.2219742843. The cubic root of 1151531421 is about 1048.1544059567.

Adding to 1151531421 its reverse (1241351511), we get a palindrome (2392882932).

The spelling of 1151531421 in words is "one billion, one hundred fifty-one million, five hundred thirty-one thousand, four hundred twenty-one".