121863731 has 4 divisors (see below), whose sum is σ = 132942264. Its totient is φ = 110785200.

The previous prime is 121863727. The next prime is 121863743. The reversal of 121863731 is 137368121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121863731 - 2² = 121863727 is a prime.

It is a super-2 number, since 2×121863731² = 29701537866480722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121863751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5539250 + ... + 5539271.

It is an arithmetic number, because the mean of its divisors is an integer number (33235566).

Almost surely, 2^121863731 is an apocalyptic number.

121863731 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121863731 is a deficient number, since it is larger than the sum of its proper divisors (11078533).

121863731 is a wasteful number, since it uses less digits than its factorization.

121863731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11078532.

The product of its digits is 6048, while the sum is 32.

The square root of 121863731 is about 11039.1906859153. The cubic root of 121863731 is about 495.7828391078.

The spelling of 121863731 in words is "one hundred twenty-one million, eight hundred sixty-three thousand, seven hundred thirty-one".