1620412603 has 4 divisors (see below), whose sum is σ = 1621478088. Its totient is φ = 1619347120.

The previous prime is 1620412571. The next prime is 1620412643. The reversal of 1620412603 is 3062140261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3062140261 = 3659 ⋅836879.

It is a cyclic number.

It is not a de Polignac number, because 1620412603 - 2⁵ = 1620412571 is a prime.

It is a super-2 number, since 2×1620412603² = 5251474007922471218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620412643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 530458 + ... + 533503.

It is an arithmetic number, because the mean of its divisors is an integer number (405369522).

Almost surely, 2^1620412603 is an apocalyptic number.

1620412603 is a deficient number, since it is larger than the sum of its proper divisors (1065485).

1620412603 is a wasteful number, since it uses less digits than its factorization.

1620412603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065484.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 1620412603 is about 40254.3488706500. The cubic root of 1620412603 is about 1174.5599929074.

Adding to 1620412603 its reverse (3062140261), we get a palindrome (4682552864).

The spelling of 1620412603 in words is "one billion, six hundred twenty million, four hundred twelve thousand, six hundred three".