121856525 has 12 divisors (see below), whose sum is σ = 172688352. Its totient is φ = 83558640.

The previous prime is 121856411. The next prime is 121856531. The reversal of 121856525 is 525658121.

It is not a de Polignac number, because 121856525 - 2¹⁰ = 121855501 is a prime.

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

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 347987 + ... + 348336.

It is an arithmetic number, because the mean of its divisors is an integer number (14390696).

Almost surely, 2^121856525 is an apocalyptic number.

It is an amenable number.

121856525 is a deficient number, since it is larger than the sum of its proper divisors (50831827).

121856525 is an equidigital number, since it uses as much as digits as its factorization.

121856525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696340 (or 696335 counting only the distinct ones).

The product of its digits is 24000, while the sum is 35.

The square root of 121856525 is about 11038.8642984684. The cubic root of 121856525 is about 495.7730667675.

The spelling of 121856525 in words is "one hundred twenty-one million, eight hundred fifty-six thousand, five hundred twenty-five".