1620151121 has 8 divisors (see below), whose sum is σ = 1660703688. Its totient is φ = 1579648000.

The previous prime is 1620151097. The next prime is 1620151129. The reversal of 1620151121 is 1211510261.

It can be written as a sum of positive squares in 4 ways, for example, as 173185600 + 1446965521 = 13160^2 + 38039^2 .

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

It is not a de Polignac number, because 1620151121 - 2¹⁰ = 1620150097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1620151093 and 1620151102.

It is not an unprimeable number, because it can be changed into a prime (1620151129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59081 + ... + 82041.

It is an arithmetic number, because the mean of its divisors is an integer number (207587961).

Almost surely, 2^1620151121 is an apocalyptic number.

It is an amenable number.

1620151121 is a deficient number, since it is larger than the sum of its proper divisors (40552567).

1620151121 is a wasteful number, since it uses less digits than its factorization.

1620151121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24723.

The product of its (nonzero) digits is 120, while the sum is 20.

The square root of 1620151121 is about 40251.1008669328. The cubic root of 1620151121 is about 1174.4968108888.

Adding to 1620151121 its reverse (1211510261), we get a palindrome (2831661382).

It can be divided in two parts, 16 and 20151121, that multiplied together give a 4-th power (322417936 = 134⁴).

The spelling of 1620151121 in words is "one billion, six hundred twenty million, one hundred fifty-one thousand, one hundred twenty-one".