121781247 has 16 divisors (see below), whose sum is σ = 185760000. Its totient is φ = 69518592.

The previous prime is 121781239. The next prime is 121781267. The reversal of 121781247 is 742187121.

It is not a de Polignac number, because 121781247 - 2³ = 121781239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121781207) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23908 + ... + 28550.

It is an arithmetic number, because the mean of its divisors is an integer number (11610000).

Almost surely, 2^121781247 is an apocalyptic number.

121781247 is a deficient number, since it is larger than the sum of its proper divisors (63978753).

121781247 is a wasteful number, since it uses less digits than its factorization.

121781247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5902.

The product of its digits is 6272, while the sum is 33.

The square root of 121781247 is about 11035.4540912461. The cubic root of 121781247 is about 495.6709562660.

The spelling of 121781247 in words is "one hundred twenty-one million, seven hundred eighty-one thousand, two hundred forty-seven".