1621799741 has 16 divisors (see below), whose sum is σ = 1724554800. Its totient is φ = 1522752000.

The previous prime is 1621799737. The next prime is 1621799761. The reversal of 1621799741 is 1479971261.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 42055225 + 1579744516 = 6485^2 + 39746^2 .

It is a cyclic number.

It is not a de Polignac number, because 1621799741 - 2² = 1621799737 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621799761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152291 + ... + 162591.

It is an arithmetic number, because the mean of its divisors is an integer number (107784675).

Almost surely, 2^1621799741 is an apocalyptic number.

It is an amenable number.

1621799741 is a deficient number, since it is larger than the sum of its proper divisors (102755059).

1621799741 is a wasteful number, since it uses less digits than its factorization.

1621799741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10480.

The product of its digits is 190512, while the sum is 47.

The square root of 1621799741 is about 40271.5748512521. The cubic root of 1621799741 is about 1174.8950540946.

The spelling of 1621799741 in words is "one billion, six hundred twenty-one million, seven hundred ninety-nine thousand, seven hundred forty-one".