101551949 has 2 divisors, whose sum is σ = 101551950. Its totient is φ = 101551948.

The previous prime is 101551883. The next prime is 101551963. The reversal of 101551949 is 949155101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64561225 + 36990724 = 8035^2 + 6082^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101551949 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101151949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50775974 + 50775975.

It is an arithmetic number, because the mean of its divisors is an integer number (50775975).

Almost surely, 2^101551949 is an apocalyptic number.

It is an amenable number.

101551949 is a deficient number, since it is larger than the sum of its proper divisors (1).

101551949 is an equidigital number, since it uses as much as digits as its factorization.

101551949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8100, while the sum is 35.

The square root of 101551949 is about 10077.2986955831. The cubic root of 101551949 is about 466.5477374374.

The spelling of 101551949 in words is "one hundred one million, five hundred fifty-one thousand, nine hundred forty-nine".