1621703144 has 8 divisors (see below), whose sum is σ = 3040693410. Its totient is φ = 810851568.

The previous prime is 1621703129. The next prime is 1621703177. The reversal of 1621703144 is 4413071261.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1236366244 + 385336900 = 35162^2 + 19630^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101356439 + ... + 101356454.

Almost surely, 2^1621703144 is an apocalyptic number.

It is an amenable number.

1621703144 is a deficient number, since it is larger than the sum of its proper divisors (1418990266).

1621703144 is a wasteful number, since it uses less digits than its factorization.

1621703144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202712899 (or 202712895 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 1621703144 is about 40270.3755135211. The cubic root of 1621703144 is about 1174.8717274187.

The spelling of 1621703144 in words is "one billion, six hundred twenty-one million, seven hundred three thousand, one hundred forty-four".