61303531 has 2 divisors, whose sum is σ = 61303532. Its totient is φ = 61303530.

The previous prime is 61303507. The next prime is 61303553. The reversal of 61303531 is 13530316.

It is an a-pointer prime, because the next prime (61303553) can be obtained adding 61303531 to its sum of digits (22).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61303531 - 2⁵ = 61303499 is a prime.

It is a super-2 number, since 2×61303531² = 7516245826135922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61303591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30651765 + 30651766.

It is an arithmetic number, because the mean of its divisors is an integer number (30651766).

Almost surely, 2^61303531 is an apocalyptic number.

61303531 is a deficient number, since it is larger than the sum of its proper divisors (1).

61303531 is an equidigital number, since it uses as much as digits as its factorization.

61303531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 810, while the sum is 22.

The square root of 61303531 is about 7829.6571444732. The cubic root of 61303531 is about 394.3015612411.

Adding to 61303531 its reverse (13530316), we get a palindrome (74833847).

The spelling of 61303531 in words is "sixty-one million, three hundred three thousand, five hundred thirty-one".