2051220731 has 8 divisors (see below), whose sum is σ = 2482149600. Its totient is φ = 1654766208.

The previous prime is 2051220683. The next prime is 2051220737. The reversal of 2051220731 is 1370221502.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2051220731 - 2¹⁸ = 2050958587 is a prime.

It is a super-2 number, since 2×2051220731² = 8415012974568348722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2051220697 and 2051220706.

It is not an unprimeable number, because it can be changed into a prime (2051220737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8618456 + ... + 8618693.

It is an arithmetic number, because the mean of its divisors is an integer number (310268700).

Almost surely, 2^2051220731 is an apocalyptic number.

2051220731 is a deficient number, since it is larger than the sum of its proper divisors (430928869).

2051220731 is a wasteful number, since it uses less digits than its factorization.

2051220731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17237173.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 2051220731 is about 45290.4044031404. The cubic root of 2051220731 is about 1270.5861949675.

The spelling of 2051220731 in words is "two billion, fifty-one million, two hundred twenty thousand, seven hundred thirty-one".