121649895 has 24 divisors (see below), whose sum is σ = 216561696. Its totient is φ = 63125568.

The previous prime is 121649887. The next prime is 121649897. The reversal of 121649895 is 598946121.

It is not a de Polignac number, because 121649895 - 2³ = 121649887 is a prime.

It is a super-2 number, since 2×121649895² = 29597393907022050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 121649895.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121649897) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34867 + ... + 38196.

It is an arithmetic number, because the mean of its divisors is an integer number (9023404).

Almost surely, 2^121649895 is an apocalyptic number.

121649895 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121649895 is a deficient number, since it is larger than the sum of its proper divisors (94911801).

121649895 is a wasteful number, since it uses less digits than its factorization.

121649895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73111 (or 73108 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 121649895 is about 11029.5011219910. The cubic root of 121649895 is about 495.4926836251.

The spelling of 121649895 in words is "one hundred twenty-one million, six hundred forty-nine thousand, eight hundred ninety-five".