775551401 has 4 divisors (see below), whose sum is σ = 788696400. Its totient is φ = 762406404.

The previous prime is 775551349. The next prime is 775551409. The reversal of 775551401 is 104155577.

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, and also an emirpimes, since its reverse is a distinct semiprime: 104155577 = 1579 ⋅65963.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-775551401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (775551409) 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, 6572411 + ... + 6572528.

It is an arithmetic number, because the mean of its divisors is an integer number (197174100).

Almost surely, 2^775551401 is an apocalyptic number.

It is an amenable number.

775551401 is a deficient number, since it is larger than the sum of its proper divisors (13144999).

775551401 is a wasteful number, since it uses less digits than its factorization.

775551401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13144998.

The product of its (nonzero) digits is 24500, while the sum is 35.

The square root of 775551401 is about 27848.7235075506. The cubic root of 775551401 is about 918.7630671410.

The spelling of 775551401 in words is "seven hundred seventy-five million, five hundred fifty-one thousand, four hundred one".