121745731 has 2 divisors, whose sum is σ = 121745732. Its totient is φ = 121745730.

The previous prime is 121745699. The next prime is 121745737. The reversal of 121745731 is 137547121.

It is a strong prime.

It is an emirp because it is prime and its reverse (137547121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121745731 - 2⁵ = 121745699 is a prime.

It is a super-2 number, since 2×121745731² = 29644046033448722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121745693 and 121745702.

It is not a weakly prime, because it can be changed into another prime (121745737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60872865 + 60872866.

It is an arithmetic number, because the mean of its divisors is an integer number (60872866).

Almost surely, 2^121745731 is an apocalyptic number.

121745731 is a deficient number, since it is larger than the sum of its proper divisors (1).

121745731 is an equidigital number, since it uses as much as digits as its factorization.

121745731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5880, while the sum is 31.

The square root of 121745731 is about 11033.8447968059. The cubic root of 121745731 is about 495.6227661389.

The spelling of 121745731 in words is "one hundred twenty-one million, seven hundred forty-five thousand, seven hundred thirty-one".