121916947 has 6 divisors (see below), whose sum is σ = 122752644. Its totient is φ = 121086900.

The previous prime is 121916941. The next prime is 121916953. The reversal of 121916947 is 749619121.

It is an interprime number because it is at equal distance from previous prime (121916941) and next prime (121916953).

It is not a de Polignac number, because 121916947 - 2¹⁹ = 121392659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121916941) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20128 + ... + 25474.

It is an arithmetic number, because the mean of its divisors is an integer number (20458774).

Almost surely, 2^121916947 is an apocalyptic number.

121916947 is a deficient number, since it is larger than the sum of its proper divisors (835697).

121916947 is an frugal number, since it uses more digits than its factorization.

121916947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5649 (or 5498 counting only the distinct ones).

The product of its digits is 27216, while the sum is 40.

The square root of 121916947 is about 11041.6007444573. The cubic root of 121916947 is about 495.8549954961.

The spelling of 121916947 in words is "one hundred twenty-one million, nine hundred sixteen thousand, nine hundred forty-seven".