1391518097 has 2 divisors, whose sum is σ = 1391518098. Its totient is φ = 1391518096.

The previous prime is 1391518091. The next prime is 1391518103. The reversal of 1391518097 is 7908151931.

It is a balanced prime because it is at equal distance from previous prime (1391518091) and next prime (1391518103).

It can be written as a sum of positive squares in only one way, i.e., 1390469521 + 1048576 = 37289^2 + 1024^2 .

It is a cyclic number.

It is not a de Polignac number, because 1391518097 - 2⁴ = 1391518081 is a prime.

It is a super-2 number, since 2×1391518097² = 3872645228557002818, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1391518091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695759048 + 695759049.

It is an arithmetic number, because the mean of its divisors is an integer number (695759049).

Almost surely, 2^1391518097 is an apocalyptic number.

It is an amenable number.

1391518097 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391518097 is an equidigital number, since it uses as much as digits as its factorization.

1391518097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 44.

The square root of 1391518097 is about 37303.0574752258. The cubic root of 1391518097 is about 1116.4251711030.

The spelling of 1391518097 in words is "one billion, three hundred ninety-one million, five hundred eighteen thousand, ninety-seven".