19961377 has 4 divisors (see below), whose sum is σ = 20259376. Its totient is φ = 19663380.

The previous prime is 19961371. The next prime is 19961393. The reversal of 19961377 is 77316991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19961377 - 2³ = 19961369 is a prime.

It is a super-2 number, since 2×19961377² = 796913143472258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19961371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148899 + ... + 149032.

It is an arithmetic number, because the mean of its divisors is an integer number (5064844).

Almost surely, 2^19961377 is an apocalyptic number.

It is an amenable number.

19961377 is a deficient number, since it is larger than the sum of its proper divisors (297999).

19961377 is an equidigital number, since it uses as much as digits as its factorization.

19961377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297998.

The product of its digits is 71442, while the sum is 43.

The square root of 19961377 is about 4467.8156855448. The cubic root of 19961377 is about 271.2669174750.

The spelling of 19961377 in words is "nineteen million, nine hundred sixty-one thousand, three hundred seventy-seven".