1620525631 has 2 divisors, whose sum is σ = 1620525632. Its totient is φ = 1620525630.

The previous prime is 1620525601. The next prime is 1620525659. The reversal of 1620525631 is 1365250261.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1620525631 - 2¹³ = 1620517439 is a prime.

It is a super-2 number, since 2×1620525631² = 5252206641455896322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1620525593 and 1620525602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1620525601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810262815 + 810262816.

It is an arithmetic number, because the mean of its divisors is an integer number (810262816).

Almost surely, 2^1620525631 is an apocalyptic number.

1620525631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620525631 is an equidigital number, since it uses as much as digits as its factorization.

1620525631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 1620525631 is about 40255.7527690143. The cubic root of 1620525631 is about 1174.5873018121.

Adding to 1620525631 its reverse (1365250261), we get a palindrome (2985775892).

The spelling of 1620525631 in words is "one billion, six hundred twenty million, five hundred twenty-five thousand, six hundred thirty-one".