1621500049 has 8 divisors (see below), whose sum is σ = 1747591272. Its totient is φ = 1495603200.

The previous prime is 1621500019. The next prime is 1621500091. The reversal of 1621500049 is 9400051261.

It can be written as a sum of positive squares in 4 ways, for example, as 24059025 + 1597441024 = 4905^2 + 39968^2 .

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

It is not a de Polignac number, because 1621500049 - 2⁷ = 1621499921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1621500019) 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, 31024 + ... + 64849.

It is an arithmetic number, because the mean of its divisors is an integer number (218448909).

Almost surely, 2^1621500049 is an apocalyptic number.

It is an amenable number.

1621500049 is a deficient number, since it is larger than the sum of its proper divisors (126091223).

1621500049 is a wasteful number, since it uses less digits than its factorization.

1621500049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97187.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 1621500049 is about 40267.8537918275. The cubic root of 1621500049 is about 1174.8226801078.

The spelling of 1621500049 in words is "one billion, six hundred twenty-one million, five hundred thousand, forty-nine".