1151431555 has 8 divisors (see below), whose sum is σ = 1400645952. Its totient is φ = 908526528.

The previous prime is 1151431517. The next prime is 1151431571. The reversal of 1151431555 is 5551341511.

It is a happy number.

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 1151431555 - 2¹³ = 1151423363 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1576939 + ... + 1577668.

It is an arithmetic number, because the mean of its divisors is an integer number (175080744).

Almost surely, 2^1151431555 is an apocalyptic number.

1151431555 is a deficient number, since it is larger than the sum of its proper divisors (249214397).

1151431555 is an equidigital number, since it uses as much as digits as its factorization.

1151431555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3154685.

The product of its digits is 7500, while the sum is 31.

The square root of 1151431555 is about 33932.7504779674. The cubic root of 1151431555 is about 1048.1241048544.

The spelling of 1151431555 in words is "one billion, one hundred fifty-one million, four hundred thirty-one thousand, five hundred fifty-five".