7494191761 has 27 divisors (see below), whose sum is σ = 8883650811. Its totient is φ = 6303608304.

The previous prime is 7494191723. The next prime is 7494191807. The reversal of 7494191761 is 1671914947.

It is a happy number.

The square root of 7494191761 is 86569.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 877996161 + 6616195600 = 29631^2 + 81340^2 .

It is not a de Polignac number, because 7494191761 - 2²³ = 7485803153 is a prime.

It is a super-2 number, since 2×7494191761² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (7494141761) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 50296515 + ... + 50296663.

Almost surely, 2^7494191761 is an apocalyptic number.

7494191761 is the 86569-th square number.

7494191761 is the 43285-th centered octagonal number.

It is an amenable number.

7494191761 is a deficient number, since it is larger than the sum of its proper divisors (1389459050).

7494191761 is an frugal number, since it uses more digits than its factorization.

7494191761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478 (or 239 counting only the distinct ones).

The product of its digits is 381024, while the sum is 49.

The cubic root of 7494191761 is about 1956.9283903790.

Multiplying 7494191761 by its sum of digits (49), we get a square (367215396289 = 605983²).

7494191761 divided by its sum of digits (49) gives a square (152942689 = 12367²).

The spelling of 7494191761 in words is "seven billion, four hundred ninety-four million, one hundred ninety-one thousand, seven hundred sixty-one".