61997953 has 2 divisors, whose sum is σ = 61997954. Its totient is φ = 61997952.

The previous prime is 61997927. The next prime is 61997983. The reversal of 61997953 is 35979916.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46881409 + 15116544 = 6847^2 + 3888^2 .

It is a cyclic number.

It is not a de Polignac number, because 61997953 - 2²¹ = 59900801 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61997897 and 61997906.

It is not a weakly prime, because it can be changed into another prime (61997983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30998976 + 30998977.

It is an arithmetic number, because the mean of its divisors is an integer number (30998977).

Almost surely, 2^61997953 is an apocalyptic number.

It is an amenable number.

61997953 is a deficient number, since it is larger than the sum of its proper divisors (1).

61997953 is an equidigital number, since it uses as much as digits as its factorization.

61997953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 459270, while the sum is 49.

The square root of 61997953 is about 7873.8778883089. The cubic root of 61997953 is about 395.7848051114.

The spelling of 61997953 in words is "sixty-one million, nine hundred ninety-seven thousand, nine hundred fifty-three".