1191400723 has 2 divisors, whose sum is σ = 1191400724. Its totient is φ = 1191400722.

The previous prime is 1191400709. The next prime is 1191400729. The reversal of 1191400723 is 3270041911.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1191400723 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1191400691 and 1191400700.

It is not a weakly prime, because it can be changed into another prime (1191400729) by changing a digit.

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 as a sum of consecutive naturals, namely, 595700361 + 595700362.

It is an arithmetic number, because the mean of its divisors is an integer number (595700362).

Almost surely, 2^1191400723 is an apocalyptic number.

1191400723 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191400723 is an equidigital number, since it uses as much as digits as its factorization.

1191400723 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 1191400723 is about 34516.6731160464. The cubic root of 1191400723 is about 1060.1141217464.

It can be divided in two parts, 119140072 and 3, that multiplied together give a triangular number (357420216 = T₂₆₇₃₆).

The spelling of 1191400723 in words is "one billion, one hundred ninety-one million, four hundred thousand, seven hundred twenty-three".