61557403 has 2 divisors, whose sum is σ = 61557404. Its totient is φ = 61557402.

The previous prime is 61557383. The next prime is 61557427. The reversal of 61557403 is 30475516.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61557403 - 2¹⁷ = 61426331 is a prime.

It is not a weakly prime, because it can be changed into another prime (61557203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30778701 + 30778702.

It is an arithmetic number, because the mean of its divisors is an integer number (30778702).

Almost surely, 2^61557403 is an apocalyptic number.

61557403 is a deficient number, since it is larger than the sum of its proper divisors (1).

61557403 is an equidigital number, since it uses as much as digits as its factorization.

61557403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 61557403 is about 7845.8525986664. The cubic root of 61557403 is about 394.8451093826.

The spelling of 61557403 in words is "sixty-one million, five hundred fifty-seven thousand, four hundred three".