1620431145 has 24 divisors (see below), whose sum is σ = 2854797192. Its totient is φ = 850060800.

The previous prime is 1620431129. The next prime is 1620431147. The reversal of 1620431145 is 5411340261.

It is a happy number.

1620431145 is a `hidden beast` number, since 1 + 620 + 4 + 31 + 1 + 4 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 3426201 + 1617004944 = 1851^2 + 40212^2 .

It is not a de Polignac number, because 1620431145 - 2⁴ = 1620431129 is a prime.

It is a super-2 number, since 2×1620431145² = 5251594191372022050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1620431147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 292416 + ... + 297905.

It is an arithmetic number, because the mean of its divisors is an integer number (118949883).

Almost surely, 2^1620431145 is an apocalyptic number.

1620431145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1620431145 is a deficient number, since it is larger than the sum of its proper divisors (1234366047).

1620431145 is a wasteful number, since it uses less digits than its factorization.

1620431145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 590393 (or 590390 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 1620431145 is about 40254.5791805106. The cubic root of 1620431145 is about 1174.5644729615.

The spelling of 1620431145 in words is "one billion, six hundred twenty million, four hundred thirty-one thousand, one hundred forty-five".