1630073531 has 4 divisors (see below), whose sum is σ = 1669831464. Its totient is φ = 1590315600.

The previous prime is 1630073521. The next prime is 1630073551. The reversal of 1630073531 is 1353700361.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1630073531 is a prime.

It is a super-2 number, since 2×1630073531² = 5314279432933615922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1630073494 and 1630073503.

It is not an unprimeable number, because it can be changed into a prime (1630073521) 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, 19878905 + ... + 19878986.

It is an arithmetic number, because the mean of its divisors is an integer number (417457866).

Almost surely, 2^1630073531 is an apocalyptic number.

1630073531 is a deficient number, since it is larger than the sum of its proper divisors (39757933).

1630073531 is an equidigital number, since it uses as much as digits as its factorization.

1630073531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39757932.

The product of its (nonzero) digits is 5670, while the sum is 29.

The square root of 1630073531 is about 40374.1691060014. The cubic root of 1630073531 is about 1176.8896182734.

Adding to 1630073531 its reverse (1353700361), we get a palindrome (2983773892).

The spelling of 1630073531 in words is "one billion, six hundred thirty million, seventy-three thousand, five hundred thirty-one".