121749637 has 2 divisors, whose sum is σ = 121749638. Its totient is φ = 121749636.

The previous prime is 121749613. The next prime is 121749643. The reversal of 121749637 is 736947121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99480676 + 22268961 = 9974^2 + 4719^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121749637 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121749637.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122749637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60874818 + 60874819.

It is an arithmetic number, because the mean of its divisors is an integer number (60874819).

Almost surely, 2^121749637 is an apocalyptic number.

It is an amenable number.

121749637 is a deficient number, since it is larger than the sum of its proper divisors (1).

121749637 is an equidigital number, since it uses as much as digits as its factorization.

121749637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 40.

The square root of 121749637 is about 11034.0217962446. The cubic root of 121749637 is about 495.6280664803.

The spelling of 121749637 in words is "one hundred twenty-one million, seven hundred forty-nine thousand, six hundred thirty-seven".