121686537 has 16 divisors (see below), whose sum is σ = 193489920. Its totient is φ = 66511632.

The previous prime is 121686529. The next prime is 121686541. The reversal of 121686537 is 735686121.

It is not a de Polignac number, because 121686537 - 2³ = 121686529 is a prime.

It is a super-2 number, since 2×121686537² = 29615226574104738, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121686495 and 121686504.

It is not an unprimeable number, because it can be changed into a prime (121686437) 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, 125487 + ... + 126452.

It is an arithmetic number, because the mean of its divisors is an integer number (12093120).

Almost surely, 2^121686537 is an apocalyptic number.

It is an amenable number.

121686537 is a deficient number, since it is larger than the sum of its proper divisors (71803383).

121686537 is a wasteful number, since it uses less digits than its factorization.

121686537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251972.

The product of its digits is 60480, while the sum is 39.

The square root of 121686537 is about 11031.1620874684. The cubic root of 121686537 is about 495.5424275243.

The spelling of 121686537 in words is "one hundred twenty-one million, six hundred eighty-six thousand, five hundred thirty-seven".