1620526531 has 16 divisors (see below), whose sum is σ = 1761727968. Its totient is φ = 1481760000.

The previous prime is 1620526529. The next prime is 1620526543. The reversal of 1620526531 is 1356250261.

It is a 8-Lehmer number, since φ(1620526531) divides (1620526531-1)⁸.

It is a cyclic number.

It is not a de Polignac number, because 1620526531 - 2¹ = 1620526529 is a prime.

It is a super-2 number, since 2×1620526531² = 5252212475349787922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1620526493 and 1620526502.

It is not an unprimeable number, because it can be changed into a prime (1620526031) 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, 641551 + ... + 644071.

It is an arithmetic number, because the mean of its divisors is an integer number (110107998).

Almost surely, 2^1620526531 is an apocalyptic number.

1620526531 is a deficient number, since it is larger than the sum of its proper divisors (141201437).

1620526531 is a wasteful number, since it uses less digits than its factorization.

1620526531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2982.

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

The square root of 1620526531 is about 40255.7639475392. The cubic root of 1620526531 is about 1174.5875192577.

Adding to 1620526531 its reverse (1356250261), we get a palindrome (2976776792).

The spelling of 1620526531 in words is "one billion, six hundred twenty million, five hundred twenty-six thousand, five hundred thirty-one".