61431949 has 2 divisors, whose sum is σ = 61431950. Its totient is φ = 61431948.

The previous prime is 61431917. The next prime is 61431977. The reversal of 61431949 is 94913416.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48399849 + 13032100 = 6957^2 + 3610^2 .

It is a cyclic number.

It is not a de Polignac number, because 61431949 - 2⁵ = 61431917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61432949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30715974 + 30715975.

It is an arithmetic number, because the mean of its divisors is an integer number (30715975).

Almost surely, 2^61431949 is an apocalyptic number.

It is an amenable number.

61431949 is a deficient number, since it is larger than the sum of its proper divisors (1).

61431949 is an equidigital number, since it uses as much as digits as its factorization.

61431949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 37.

The square root of 61431949 is about 7837.8535964893. The cubic root of 61431949 is about 394.5766954860.

The spelling of 61431949 in words is "sixty-one million, four hundred thirty-one thousand, nine hundred forty-nine".