1961290403 has 2 divisors, whose sum is σ = 1961290404. Its totient is φ = 1961290402.

The previous prime is 1961290399. The next prime is 1961290537. The reversal of 1961290403 is 3040921691.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1961290403 - 2² = 1961290399 is a prime.

It is not a weakly prime, because it can be changed into another prime (1961290003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 980645201 + 980645202.

It is an arithmetic number, because the mean of its divisors is an integer number (980645202).

Almost surely, 2^1961290403 is an apocalyptic number.

1961290403 is a deficient number, since it is larger than the sum of its proper divisors (1).

1961290403 is an equidigital number, since it uses as much as digits as its factorization.

1961290403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 1961290403 is about 44286.4584607981. The cubic root of 1961290403 is about 1251.7395307433.

The spelling of 1961290403 in words is "one billion, nine hundred sixty-one million, two hundred ninety thousand, four hundred three".