121371551 has 16 divisors (see below), whose sum is σ = 147308544. Its totient is φ = 97620864.

The previous prime is 121371539. The next prime is 121371557. The reversal of 121371551 is 155173121.

It is a cyclic number.

It is not a de Polignac number, because 121371551 - 2¹⁰ = 121370527 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121371551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121371557) 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, 44246 + ... + 46908.

It is an arithmetic number, because the mean of its divisors is an integer number (9206784).

Almost surely, 2^121371551 is an apocalyptic number.

121371551 is a deficient number, since it is larger than the sum of its proper divisors (25936993).

121371551 is a wasteful number, since it uses less digits than its factorization.

121371551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3070.

The product of its digits is 1050, while the sum is 26.

The square root of 121371551 is about 11016.8757367958. The cubic root of 121371551 is about 495.1144870036.

The spelling of 121371551 in words is "one hundred twenty-one million, three hundred seventy-one thousand, five hundred fifty-one".