1214891897 has 4 divisors (see below), whose sum is σ = 1215937680. Its totient is φ = 1213846116.

The previous prime is 1214891879. The next prime is 1214891903. The reversal of 1214891897 is 7981984121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1214891897 - 2⁸ = 1214891641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1214891837) 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, 521147 + ... + 523472.

It is an arithmetic number, because the mean of its divisors is an integer number (303984420).

Almost surely, 2^1214891897 is an apocalyptic number.

It is an amenable number.

1214891897 is a deficient number, since it is larger than the sum of its proper divisors (1045783).

1214891897 is a wasteful number, since it uses less digits than its factorization.

1214891897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1045782.

The product of its digits is 290304, while the sum is 50.

The square root of 1214891897 is about 34855.2994105631. The cubic root of 1214891897 is about 1067.0363434259.

The spelling of 1214891897 in words is "one billion, two hundred fourteen million, eight hundred ninety-one thousand, eight hundred ninety-seven".