55921403 has 2 divisors, whose sum is σ = 55921404. Its totient is φ = 55921402.

The previous prime is 55921379. The next prime is 55921421. The reversal of 55921403 is 30412955.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55921403 - 2⁸ = 55921147 is a prime.

It is not a weakly prime, because it can be changed into another prime (55921423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27960701 + 27960702.

It is an arithmetic number, because the mean of its divisors is an integer number (27960702).

Almost surely, 2^55921403 is an apocalyptic number.

55921403 is a deficient number, since it is larger than the sum of its proper divisors (1).

55921403 is an equidigital number, since it uses as much as digits as its factorization.

55921403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 55921403 is about 7478.0614466585. The cubic root of 55921403 is about 382.4071638795.

The spelling of 55921403 in words is "fifty-five million, nine hundred twenty-one thousand, four hundred three".