121731716 has 6 divisors (see below), whose sum is σ = 213030510. Its totient is φ = 60865856.

The previous prime is 121731707. The next prime is 121731721. The reversal of 121731716 is 617137121.

It can be written as a sum of positive squares in only one way, i.e., 101929216 + 19802500 = 10096^2 + 4450^2 .

It is a super-2 number, since 2×121731716² = 29637221360609312, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15216461 + ... + 15216468.

It is an arithmetic number, because the mean of its divisors is an integer number (35505085).

Almost surely, 2^121731716 is an apocalyptic number.

It is an amenable number.

121731716 is a deficient number, since it is larger than the sum of its proper divisors (91298794).

121731716 is a wasteful number, since it uses less digits than its factorization.

121731716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30432933 (or 30432931 counting only the distinct ones).

The product of its digits is 1764, while the sum is 29.

The square root of 121731716 is about 11033.2096871219. The cubic root of 121731716 is about 495.6037472116.

Adding to 121731716 its reverse (617137121), we get a palindrome (738868837).

The spelling of 121731716 in words is "one hundred twenty-one million, seven hundred thirty-one thousand, seven hundred sixteen".