121725511 has 4 divisors (see below), whose sum is σ = 121771312. Its totient is φ = 121679712.

The previous prime is 121725509. The next prime is 121725553. The reversal of 121725511 is 115527121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121725511 - 2¹ = 121725509 is a prime.

It is a super-2 number, since 2×121725511² = 29634200056422242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121725811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18651 + ... + 24316.

It is an arithmetic number, because the mean of its divisors is an integer number (30442828).

Almost surely, 2^121725511 is an apocalyptic number.

121725511 is a deficient number, since it is larger than the sum of its proper divisors (45801).

121725511 is an equidigital number, since it uses as much as digits as its factorization.

121725511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45800.

The product of its digits is 700, while the sum is 25.

The square root of 121725511 is about 11032.9284870337. The cubic root of 121725511 is about 495.5953263070.

The spelling of 121725511 in words is "one hundred twenty-one million, seven hundred twenty-five thousand, five hundred eleven".