1214521897 has 2 divisors, whose sum is σ = 1214521898. Its totient is φ = 1214521896.

The previous prime is 1214521879. The next prime is 1214521907. The reversal of 1214521897 is 7981254121.

Together with previous prime (1214521879) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 956726761 + 257795136 = 30931^2 + 16056^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1214521897 is a prime.

It is not a weakly prime, because it can be changed into another prime (1214521817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607260948 + 607260949.

It is an arithmetic number, because the mean of its divisors is an integer number (607260949).

Almost surely, 2^1214521897 is an apocalyptic number.

It is an amenable number.

1214521897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1214521897 is an equidigital number, since it uses as much as digits as its factorization.

1214521897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 40.

The square root of 1214521897 is about 34849.9913486359. The cubic root of 1214521897 is about 1066.9280090865.

The spelling of 1214521897 in words is "one billion, two hundred fourteen million, five hundred twenty-one thousand, eight hundred ninety-seven".