1215121097 has 2 divisors, whose sum is σ = 1215121098. Its totient is φ = 1215121096.

The previous prime is 1215121081. The next prime is 1215121139. The reversal of 1215121097 is 7901215121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 974126521 + 240994576 = 31211^2 + 15524^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215121097 - 2⁴ = 1215121081 is a prime.

It is not a weakly prime, because it can be changed into another prime (1215121057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607560548 + 607560549.

It is an arithmetic number, because the mean of its divisors is an integer number (607560549).

Almost surely, 2^1215121097 is an apocalyptic number.

It is an amenable number.

1215121097 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215121097 is an equidigital number, since it uses as much as digits as its factorization.

1215121097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 29.

The square root of 1215121097 is about 34858.5871343059. The cubic root of 1215121097 is about 1067.1034411247.

The spelling of 1215121097 in words is "one billion, two hundred fifteen million, one hundred twenty-one thousand, ninety-seven".