761531 has 2 divisors, whose sum is σ = 761532. Its totient is φ = 761530.

The previous prime is 761521. The next prime is 761533. The reversal of 761531 is 135167.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-761531 is a prime.

It is a super-2 number, since 2×761531² = 1159858927922, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 761533, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 761497 and 761506.

It is not a weakly prime, because it can be changed into another prime (761533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 380765 + 380766.

It is an arithmetic number, because the mean of its divisors is an integer number (380766).

2⁷⁶¹⁵³¹ is an apocalyptic number.

761531 is a deficient number, since it is larger than the sum of its proper divisors (1).

761531 is an equidigital number, since it uses as much as digits as its factorization.

761531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 630, while the sum is 23.

The square root of 761531 is about 872.6574356527. The cubic root of 761531 is about 91.3192905873.

Adding to 761531 its reverse (135167), we get a palindrome (896698).

The spelling of 761531 in words is "seven hundred sixty-one thousand, five hundred thirty-one".