61972949 has 2 divisors, whose sum is σ = 61972950. Its totient is φ = 61972948.

The previous prime is 61972919. The next prime is 61972961. The reversal of 61972949 is 94927916.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31248100 + 30724849 = 5590^2 + 5543^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61972949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61972919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30986474 + 30986475.

It is an arithmetic number, because the mean of its divisors is an integer number (30986475).

Almost surely, 2^61972949 is an apocalyptic number.

It is an amenable number.

61972949 is a deficient number, since it is larger than the sum of its proper divisors (1).

61972949 is an equidigital number, since it uses as much as digits as its factorization.

61972949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 47.

The square root of 61972949 is about 7872.2899463879. The cubic root of 61972949 is about 395.7315908063.

The spelling of 61972949 in words is "sixty-one million, nine hundred seventy-two thousand, nine hundred forty-nine".