61978453 has 2 divisors, whose sum is σ = 61978454. Its totient is φ = 61978452.

The previous prime is 61978421. The next prime is 61978463. The reversal of 61978453 is 35487916.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43125489 + 18852964 = 6567^2 + 4342^2 .

It is a cyclic number.

It is not a de Polignac number, because 61978453 - 2⁵ = 61978421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61978463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30989226 + 30989227.

It is an arithmetic number, because the mean of its divisors is an integer number (30989227).

Almost surely, 2^61978453 is an apocalyptic number.

It is an amenable number.

61978453 is a deficient number, since it is larger than the sum of its proper divisors (1).

61978453 is an equidigital number, since it uses as much as digits as its factorization.

61978453 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 43.

The square root of 61978453 is about 7872.6395192464. The cubic root of 61978453 is about 395.7433058220.

The spelling of 61978453 in words is "sixty-one million, nine hundred seventy-eight thousand, four hundred fifty-three".