49720981 has 2 divisors, whose sum is σ = 49720982. Its totient is φ = 49720980.

The previous prime is 49720973. The next prime is 49721033. The reversal of 49720981 is 18902794.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48302500 + 1418481 = 6950^2 + 1191^2 .

It is a cyclic number.

It is not a de Polignac number, because 49720981 - 2³ = 49720973 is a prime.

It is a super-2 number, since 2×49720981² = 4944351903204722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49720921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24860490 + 24860491.

It is an arithmetic number, because the mean of its divisors is an integer number (24860491).

Almost surely, 2^49720981 is an apocalyptic number.

It is an amenable number.

49720981 is a deficient number, since it is larger than the sum of its proper divisors (1).

49720981 is an equidigital number, since it uses as much as digits as its factorization.

49720981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 49720981 is about 7051.3105874015. The cubic root of 49720981 is about 367.7165946732.

The spelling of 49720981 in words is "forty-nine million, seven hundred twenty thousand, nine hundred eighty-one".