61921949 has 2 divisors, whose sum is σ = 61921950. Its totient is φ = 61921948.

The previous prime is 61921913. The next prime is 61921961. The reversal of 61921949 is 94912916.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50665924 + 11256025 = 7118^2 + 3355^2 .

It is a cyclic number.

It is not a de Polignac number, because 61921949 - 2⁸ = 61921693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61921999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30960974 + 30960975.

It is an arithmetic number, because the mean of its divisors is an integer number (30960975).

Almost surely, 2^61921949 is an apocalyptic number.

It is an amenable number.

61921949 is a deficient number, since it is larger than the sum of its proper divisors (1).

61921949 is an equidigital number, since it uses as much as digits as its factorization.

61921949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 41.

The square root of 61921949 is about 7869.0500697352. The cubic root of 61921949 is about 395.6230066027.

The spelling of 61921949 in words is "sixty-one million, nine hundred twenty-one thousand, nine hundred forty-nine".