61506131 has 2 divisors, whose sum is σ = 61506132. Its totient is φ = 61506130.

The previous prime is 61506103. The next prime is 61506167. The reversal of 61506131 is 13160516.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61506131 - 2²² = 57311827 is a prime.

It is a super-2 number, since 2×61506131² = 7566008301178322, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 61506097 and 61506106.

It is not a weakly prime, because it can be changed into another prime (61506931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30753065 + 30753066.

It is an arithmetic number, because the mean of its divisors is an integer number (30753066).

Almost surely, 2^61506131 is an apocalyptic number.

61506131 is a deficient number, since it is larger than the sum of its proper divisors (1).

61506131 is an equidigital number, since it uses as much as digits as its factorization.

61506131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 61506131 is about 7842.5844592201. The cubic root of 61506131 is about 394.7354549749.

Adding to 61506131 its reverse (13160516), we get a palindrome (74666647).

The spelling of 61506131 in words is "sixty-one million, five hundred six thousand, one hundred thirty-one".