61491203 has 2 divisors, whose sum is σ = 61491204. Its totient is φ = 61491202.

The previous prime is 61491119. The next prime is 61491251. The reversal of 61491203 is 30219416.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61491203 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61491253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30745601 + 30745602.

It is an arithmetic number, because the mean of its divisors is an integer number (30745602).

Almost surely, 2^61491203 is an apocalyptic number.

61491203 is a deficient number, since it is larger than the sum of its proper divisors (1).

61491203 is an equidigital number, since it uses as much as digits as its factorization.

61491203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 61491203 is about 7841.6326743861. The cubic root of 61491203 is about 394.7035173043.

The spelling of 61491203 in words is "sixty-one million, four hundred ninety-one thousand, two hundred three".