1031520551 has 2 divisors, whose sum is σ = 1031520552. Its totient is φ = 1031520550.

The previous prime is 1031520527. The next prime is 1031520569. The reversal of 1031520551 is 1550251301.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1031520551 - 2⁶ = 1031520487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1031520571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 515760275 + 515760276.

It is an arithmetic number, because the mean of its divisors is an integer number (515760276).

Almost surely, 2^1031520551 is an apocalyptic number.

1031520551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1031520551 is an equidigital number, since it uses as much as digits as its factorization.

1031520551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 750, while the sum is 23.

The square root of 1031520551 is about 32117.2936437677. The cubic root of 1031520551 is about 1010.3983498770.

Adding to 1031520551 its reverse (1550251301), we get a palindrome (2581771852).

The spelling of 1031520551 in words is "one billion, thirty-one million, five hundred twenty thousand, five hundred fifty-one".