1368191531 has 4 divisors (see below), whose sum is σ = 1563647472. Its totient is φ = 1172735592.

The previous prime is 1368191527. The next prime is 1368191543. The reversal of 1368191531 is 1351918631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1351918631 = 7 ⋅193131233.

It is not a de Polignac number, because 1368191531 - 2² = 1368191527 is a prime.

It is a super-2 number, since 2×1368191531² = 3743896131000247922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1368191431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97727960 + ... + 97727973.

It is an arithmetic number, because the mean of its divisors is an integer number (390911868).

Almost surely, 2^1368191531 is an apocalyptic number.

1368191531 is a deficient number, since it is larger than the sum of its proper divisors (195455941).

1368191531 is an equidigital number, since it uses as much as digits as its factorization.

1368191531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195455940.

The product of its digits is 19440, while the sum is 38.

The square root of 1368191531 is about 36989.0731297771. The cubic root of 1368191531 is about 1110.1516257984.

The spelling of 1368191531 in words is "one billion, three hundred sixty-eight million, one hundred ninety-one thousand, five hundred thirty-one".