1151631989 has 8 divisors (see below), whose sum is σ = 1189174272. Its totient is φ = 1114114320.

The previous prime is 1151631983. The next prime is 1151631991. The reversal of 1151631989 is 9891361511.

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 1151631989 - 2⁴ = 1151631973 is a prime.

It is a super-2 number, since 2×1151631989² = 2652512476176192242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1151631983) 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, 164372 + ... + 171234.

It is an arithmetic number, because the mean of its divisors is an integer number (148646784).

Almost surely, 2^1151631989 is an apocalyptic number.

It is an amenable number.

1151631989 is a deficient number, since it is larger than the sum of its proper divisors (37542283).

1151631989 is an equidigital number, since it uses as much as digits as its factorization.

1151631989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12307.

The product of its digits is 58320, while the sum is 44.

The square root of 1151631989 is about 33935.7037498856. The cubic root of 1151631989 is about 1048.1849182877.

The spelling of 1151631989 in words is "one billion, one hundred fifty-one million, six hundred thirty-one thousand, nine hundred eighty-nine".