121573551 has 8 divisors (see below), whose sum is σ = 176834304. Its totient is φ = 73680920.

The previous prime is 121573541. The next prime is 121573559. The reversal of 121573551 is 155375121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121573551 - 2¹¹ = 121571503 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121573559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1841991 + ... + 1842056.

It is an arithmetic number, because the mean of its divisors is an integer number (22104288).

Almost surely, 2^121573551 is an apocalyptic number.

121573551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121573551 is a deficient number, since it is larger than the sum of its proper divisors (55260753).

121573551 is a wasteful number, since it uses less digits than its factorization.

121573551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3684061.

The product of its digits is 5250, while the sum is 30.

The square root of 121573551 is about 11026.0396788693. The cubic root of 121573551 is about 495.3890095818.

The spelling of 121573551 in words is "one hundred twenty-one million, five hundred seventy-three thousand, five hundred fifty-one".