121505434537 has 2 divisors, whose sum is σ = 121505434538. Its totient is φ = 121505434536.

The previous prime is 121505434481. The next prime is 121505434543. The reversal of 121505434537 is 735434505121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98309839936 + 23195594601 = 313544^2 + 152301^2 .

It is an emirp because it is prime and its reverse (735434505121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121505434537 - 2⁷ = 121505434409 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121505434537.

It is not a weakly prime, because it can be changed into another prime (121505434577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60752717268 + 60752717269.

It is an arithmetic number, because the mean of its divisors is an integer number (60752717269).

Almost surely, 2^121505434537 is an apocalyptic number.

It is an amenable number.

121505434537 is a deficient number, since it is larger than the sum of its proper divisors (1).

121505434537 is an equidigital number, since it uses as much as digits as its factorization.

121505434537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252000, while the sum is 40.

Adding to 121505434537 its reverse (735434505121), we get a palindrome (856939939658).

The spelling of 121505434537 in words is "one hundred twenty-one billion, five hundred five million, four hundred thirty-four thousand, five hundred thirty-seven".