9919451501 has 2 divisors, whose sum is σ = 9919451502. Its totient is φ = 9919451500.

The previous prime is 9919451461. The next prime is 9919451527. The reversal of 9919451501 is 1051549199.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7402021225 + 2517430276 = 86035^2 + 50174^2 .

It is an emirp because it is prime and its reverse (1051549199) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9919451501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9919451401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4959725750 + 4959725751.

It is an arithmetic number, because the mean of its divisors is an integer number (4959725751).

Almost surely, 2^9919451501 is an apocalyptic number.

It is an amenable number.

9919451501 is a deficient number, since it is larger than the sum of its proper divisors (1).

9919451501 is an equidigital number, since it uses as much as digits as its factorization.

9919451501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72900, while the sum is 44.

The square root of 9919451501 is about 99596.4432146048. The cubic root of 9919451501 is about 2148.6345395807.

The spelling of 9919451501 in words is "nine billion, nine hundred nineteen million, four hundred fifty-one thousand, five hundred one".