49990981 has 2 divisors, whose sum is σ = 49990982. Its totient is φ = 49990980.

The previous prime is 49990973. The next prime is 49991017. The reversal of 49990981 is 18909994.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49126081 + 864900 = 7009^2 + 930^2 .

It is a cyclic number.

It is not a de Polignac number, because 49990981 - 2³ = 49990973 is a prime.

It is a super-2 number, since 2×49990981² = 4998196362684722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49990921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24995490 + 24995491.

It is an arithmetic number, because the mean of its divisors is an integer number (24995491).

Almost surely, 2^49990981 is an apocalyptic number.

It is an amenable number.

49990981 is a deficient number, since it is larger than the sum of its proper divisors (1).

49990981 is an equidigital number, since it uses as much as digits as its factorization.

49990981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 49.

The square root of 49990981 is about 7070.4300434981. The cubic root of 49990981 is about 368.3809976787.

The spelling of 49990981 in words is "forty-nine million, nine hundred ninety thousand, nine hundred eighty-one".