121351647 has 4 divisors (see below), whose sum is σ = 161802200. Its totient is φ = 80901096.

The previous prime is 121351621. The next prime is 121351649. The reversal of 121351647 is 746153121.

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

It is a de Polignac number, because none of the positive numbers 2^k-121351647 is a prime.

It is a super-2 number, since 2×121351647² = 29452444459225218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121351649) 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, 20225272 + ... + 20225277.

It is an arithmetic number, because the mean of its divisors is an integer number (40450550).

Almost surely, 2^121351647 is an apocalyptic number.

121351647 is a deficient number, since it is larger than the sum of its proper divisors (40450553).

121351647 is an equidigital number, since it uses as much as digits as its factorization.

121351647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40450552.

The product of its digits is 5040, while the sum is 30.

The square root of 121351647 is about 11015.9723583531. The cubic root of 121351647 is about 495.0874205359.

The spelling of 121351647 in words is "one hundred twenty-one million, three hundred fifty-one thousand, six hundred forty-seven".