121961731 has 4 divisors (see below), whose sum is σ = 125258032. Its totient is φ = 118665432.

The previous prime is 121961729. The next prime is 121961743. The reversal of 121961731 is 137169121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 137169121 = 3299 ⋅41579.

It is a cyclic number.

It is not a de Polignac number, because 121961731 - 2¹ = 121961729 is a prime.

It is a super-2 number, since 2×121961731² = 29749327657032722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121961693 and 121961702.

It is not an unprimeable number, because it can be changed into a prime (121961711) 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, 1648095 + ... + 1648168.

It is an arithmetic number, because the mean of its divisors is an integer number (31314508).

Almost surely, 2^121961731 is an apocalyptic number.

121961731 is a deficient number, since it is larger than the sum of its proper divisors (3296301).

121961731 is an equidigital number, since it uses as much as digits as its factorization.

121961731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3296300.

The product of its digits is 2268, while the sum is 31.

The square root of 121961731 is about 11043.6285250818. The cubic root of 121961731 is about 495.9157025380.

The spelling of 121961731 in words is "one hundred twenty-one million, nine hundred sixty-one thousand, seven hundred thirty-one".