1621551122 has 8 divisors (see below), whose sum is σ = 2498065356. Its totient is φ = 788862672.

The previous prime is 1621551091. The next prime is 1621551157. The reversal of 1621551122 is 2211551261.

It can be written as a sum of positive squares in 2 ways, for example, as 1332177001 + 289374121 = 36499^2 + 17011^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 1621551091 and 1621551100.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10956353 + ... + 10956500.

Almost surely, 2^1621551122 is an apocalyptic number.

1621551122 is a deficient number, since it is larger than the sum of its proper divisors (876514234).

1621551122 is a wasteful number, since it uses less digits than its factorization.

1621551122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21912892.

The product of its digits is 1200, while the sum is 26.

The square root of 1621551122 is about 40268.4879527404. The cubic root of 1621551122 is about 1174.8350145896.

The spelling of 1621551122 in words is "one billion, six hundred twenty-one million, five hundred fifty-one thousand, one hundred twenty-two".