121951655 has 16 divisors (see below), whose sum is σ = 171139584. Its totient is φ = 81678240.

The previous prime is 121951649. The next prime is 121951663. The reversal of 121951655 is 556159121.

It is not a de Polignac number, because 121951655 - 2⁴ = 121951639 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39011 + ... + 42020.

It is an arithmetic number, because the mean of its divisors is an integer number (10696224).

Almost surely, 2^121951655 is an apocalyptic number.

121951655 is a deficient number, since it is larger than the sum of its proper divisors (49187929).

121951655 is an equidigital number, since it uses as much as digits as its factorization.

121951655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81086.

The product of its digits is 13500, while the sum is 35.

The square root of 121951655 is about 11043.1723250160. The cubic root of 121951655 is about 495.9020452916.

The spelling of 121951655 in words is "one hundred twenty-one million, nine hundred fifty-one thousand, six hundred fifty-five".